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—How did he get my telephone number?
—You ________ it . You told him last week.
A.should have forgottenB.may have forgotten
C.must have forgottenD.could have forgotten
B

试题分析:考查情态动词用法。本题考查了“情态动词+have done”的不同含义,这个结构可以表示对过去情况的推测,也可以表示虚拟语气。Should have done本应该做某事,实际上却未做;may have done也许做了某事;must have done一定做了某事;could have done本可以做某事,实际上却未做;句意:—他是怎么拿到我的电话号码的?—你也许忘记了,上个星期你告诉他的。故B正确。
点评:情态动词+have done”的不同含义,这个结构可以表示对过去情况的推测,也可以表示虚拟语气是高考必考考点,一定要牢记句型意思。must have done过去肯定做了某事。should have done 本应该做而实际未做。can’t have done 过去不可能做了某事;shouldn’t have done 本不应该做而实际做了。 need have done 本有必要做某事;needn’t have done 本没有必要做某事;注意没有 mustn’t have done的形式。
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