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【题目】I didn't hear the phone. I ______ asleep.
A.must be
B.must have been
C.should be
D.should have been

【答案】B
【解析】句意:我没听到电话,我一定睡着了。must be一定,对现在情况的肯定猜测;must have been一定,对过去情况的肯定猜测;should be(按常理)应该;should have been本应该做的事而没有作。句中didn't是过去式,根据句意可知选B。

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