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【单选题】
A man escaped from the prison last night. It was a long time （） the guards discovered what had happened.
A.
before
B.
until
C.
since
D.
when
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】You （） all those calculations! We have a computer to do that sort of thing.
A.
needn’t have done
B.
must not have done
C.
shouldn’t have done
D.
can not have done
【单选题】Skin Cancer Skin Cancer56（） A.up B.on C.off D.to
A.
Melanoma (黑素瘤), the deadliest kind of skin cancer, is now the most common cancer in (51) British women, the country’s leading cancer organization said Wednesday. Skin cancer has (52) cervical (子宫颈的) cancer as the top cancer striking women in their 20s, according to the latest data from Cancer Research United Kingdom.
B.
The trend is particularly (53) since younger people are not generally those most susceptible (易患的) to melanoma. Rates of skin cancer are (54) highest in people over age 75.
C.
But experts worry that increasing numbers of younger people being diagnosed with skin cancer could be the (55) of a dangerous trend. Women in their 20s make (56) a small percentage of all patients diagnosed with melanoma in Britain, but nearly a third of all cases occur in people younger than 50.
D.
Based on current numbers, Cancer Research UK predicts that melanoma will become the fourth (57) common cancer for men and women of all ages by 2024, and that cases will jump from about 9,000 cases a year to more than 15,500.
E.
Cancer experts (58) the rising number of skin cancer cases largely to the surge in people using tanning salons. "Spending time on sun beds is just as (59) as staying out too long in the sun," said Caroline Cerny of Cancer Research UK. The organization is starting a SunSmart (60) to warn Britons of the dangers of being too bronzed.
F.
"The intensity of ultraviolet rays in some sun beds can be more than 10 (61) stronger than the midday sun," Cerny said.
G.
In the United States, several states require parental approval (62) minors can use tanning salons. Wisconsin bans people 16 and (63) from using tanning beds, and others ban children under 14. At least 29 states have regulations governing minors’ use of tanning salons.
H.
In the U. K. , Scottish politicians passed legislation banning those under 18 from using tanning beds, though it hasn’t yet been implemented. There are no plans for (64) in the rest of the U. K.
I.
The World Health Organization has previously recommended that tanning beds be regulated because of their potential to damage DNA in the skin.
J.
Experts said most deadly skin cancers could be (65) if people took the proper precautions when in the sun and avoided tanning beds.
【单选题】He must have had an accident, or he （） then.
A.
would have been here
B.
had to be here
C.
should be here
D.
would be here