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【单选题】
Scientists say it may be five or six years ________ it is possible to test this medicine on human patients.
[ ]
A.
since
B.
after
C.
before
D.
when
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】_______ children get older, they become more and more interested in everything.
A.
Once
B.
Whether
C.
With
D.
As
【单选题】— Jack has spent an hour in the shoe shop．Hasn't he decided which pair of shoes to buy?— Maybe．Young as he is, he isabout his appearance．
A.
special
B.
curious
C.
particular
D.
confident
【单选题】I have learned a lot about Asian customs, ______ in the small village for three years in the early 1990s.
A.
lived
B.
to live
C.
having lived
D.
to have lived
【单选题】When the teacher praised him for working out the math problem, Jack looked __________ about at his classmates.
A.
proud
B.
proudly
C.
pride
D.
pridely
【单选题】So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
A.
many of which
B.
many of whom
C.
many of that
D.
many of them
【单选题】—Is that Jack speaking? —Sorry, he _______ in. He _______ back in half an hour. [ ]
A.
isn't; will be
B.
wasn't; will
C.
isn't; is
D.
wasn't; was
【单选题】The tourists from Australia _______have hurried to the airport-the flight was called off becauseof the heavy fog. [ ]
A.
mustn't
B.
couldn't
C.
needn't
D.
wouldn't
【单选题】This building was modelled __________ the Catholic church.
A.
with
B.
to
C.
after
D.
as
【单选题】(2013·郑州二模)A college is going to ________ a student's ability based on grades and then make the decision to admit or refuse an applicant.
A.
experiment
B.
parallel
C.
assess
D.
observe
【单选题】So far nothing ________ Tom.I want to know the reason ________ he hasn't written to me.[ ]
A.
heard from；why
B.
has been heard from；why
C.
was heard from；that
D.
has heard from；that