【題目】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：我沒聽到電話，我一定睡著了。must be一定，對現(xiàn)在情況的肯定猜測；must have been一定，對過去情況的肯定猜測；should be（按常理）應(yīng)該；should have been本應(yīng)該做的事而沒有作。句中didn't是過去式，根據(jù)句意可知選B。

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