【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(duì)現(xiàn)在情況的肯定猜測(cè);must have been一定,對(duì)過去情況的肯定猜測(cè);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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