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情态动词部分练习题(附答案)
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a) needn’t have washed b) shouldn’t have washed
c) must not have washed d) can not have washed
2) john’s score on the test is the highest in the class; he____ last night.
a) should study b) should have studied c) must have studied d) must have to study
3) the room is in a terrible mess; it ____cleaned. (cet-4, 1996,6)
a) can’t have been b) shouldn’t have been c) mustn’t have been d) wouldn’t have been
4) nobody knows how people first came to these islands. they ____ from south america on rafts.
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