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【单选题】
Although the causes of cancer ________, we do not yet have any practical way to pr it．
A.
have uncovered
B.
have been uncovering
C.
are uncovering
D.
are being uncovered
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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】I hated it when people don’t ___________ their promises．
A.
carry out
B.
look out
C.
run out
D.
find out
【单选题】He wasn’t looking forward to the time ______ he had to give evidence to the court.
A.
which
B.
when
C.
that
D.
whenever
【单选题】In the new century, we still should _____ primary importance to the development of economy.
A.
perform
B.
attack
C.
seek
D.
attach
【单选题】We are invited to a party ____ in our club next Friday.
A.
to be held
B.
held
C.
being held
D.
holding
【单选题】The first prize winner_______, John was so disappointed that he felt unwilling to know the rest results.[ ]
A.
announcing
B.
announced
C.
was announced
D.
had been announced
【单选题】---What major will you choose when you are at university?---____ but English, which has brought terrible dreams to me for the past 12 years．---What major will you choose when you are at university?---...
A.
Anything
B.
Nothing
C.
Something
D.
Everything
【单选题】The little town has now grown into a modern big city, and is _____ what it used to be. [ ]
A.
twice the size than
B.
two times the size as
C.
twice the size as
D.
twice the size of
【单选题】119．My new boss offers me a much higher salary, ______ I can get a considerable bonus at the end of the year.
A.
except for that
B.
on top of that
C.
except for which
D.
on top of which
【单选题】My mother and her old friends talked of some things and people ________ they remembered in the school.
A.
whom
B.
which
C.
who
D.
that
【单选题】Ted came for the weekend wearing only some shorts and a T-shirt, _______ is a stupid thing to do in such weather．
A.
this
B.
that
C.
what
D.
which