(2005天津﹚I
have been more than six years old when the accident happened.
A. shouldn’t
B.couldn’t
C.mustn’t
D.needn’t
’t have done是对过去发生情况的否定推测, 其肯定形式同样是对过去发生情况的推测, 意为 “可能已……”。shouldn’t have done本来不应该……, 但实际已经……;needn’t have done本来不需要……, 但实际上已经……;must表示推测时, 只用在肯定句中。故选B项。
(2005辽宁﹚This cake is very sweet. You
a lot of sugar in it.
A.should put
B.could have put
C.might put
D.must have put
“他肯定没走远”, 此处是对过去的否定推测, 而且语气最强, 故用can’t have done。
(2005江苏﹚—Don’t you think it necessary that he
to Miami but to New York?
—I agree, but the problem is
he has refused to.
A.will not be sent;that
B.not be sent;that
C.should not be sent;what
D.should not send;what
本题考查虚拟语气中情态动词的用法。He paid for a seat, when he ______ have entered free.
A. could
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