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题目
题型:不详难度:来源:
--What do you think of it?
--I think it is a thing of importance that it ____ done soon.
A.is B.is to be C.be D.to be

答案
D
解析
can/could not +have done用于疑问句或否定句时,表示对过去情况的推测.表示不可能作过某事。
核心考点
试题【--What do you think of it?--I think it is a thing of importance that it ____ don】;主要考察你对虚拟语气等知识点的理解。[详细]
举一反三
Since the road is wet this morning, _____ last night.
A.it must rain B.it must be raining C.it must have rainedD.it must have been rain

题型:不详难度:| 查看答案
— Will your brother stay home tonight?
— I’m not quite sure. He _____ to the cinema tonight.
A.must goB.can goC.may goD.may be going

题型:不详难度:| 查看答案
You must be a writer, _____?
A.mustn’t youB.are youC.must youD.aren’t you

题型:不详难度:| 查看答案
I got up early that morning, but I _____ so because I had no work to do.
A.mustn’t have doneB.didn’t need to do C.needn’t have doneD.can’t have done

题型:不详难度:| 查看答案
I missed the last bus, so I _____ go home on foot.
A.must B.have toC.may D.had to

题型:不详难度:| 查看答案
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