So far no life has been found outside the earth, but while some scientists are a
题型:不详难度:来源:
So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.
A. mustn’t be
| B. may not be
| C. can’t be
| D. won’t be
|
|
答案
C |
解析
这题考查情态动词的用法:can’t be“不可能”句意是:到目前为止没有发现生命在地球上,但有些科学家正在积极寻找生物在外层空间,别人相信不可能有。选C |
举一反三
He commanded that all the gates . A.should shut | B.would be shut | C.shut | D.be shut |
|
Determined to devote himself to those poor children, he chose to teach in a western province, though he _______ in the city for a better life. A could stay B would have stayed C could have stayed D had stayed |
But for the heavy traffic, the police ___ the thieves who tried to escape in the stolen car. A.would not catch | B.couldn’t have caught | C.haven’t caught | D.couldn’t catch |
|
Generally speaking, my grandmother is nice and kind, but she _______ be very stubborn at times.A.should | B.shall | C.must | D.can |
|
— Mum, would you please buy me an MP5 player? — If you can help do some housework the whole vacation, you ____ have one as a reward. A.must | B.need | C.would | D.shall |
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