選B
must have been 是對過去的猜測,我沒聽見電話響,我一定是睡著了.那A不行嗎？A表示對現(xiàn)在的推測，而前一句用的是過去式。
I did not hear the phone,I___asleep.A.must be B.must have been C.should be D.should have been
I did not hear the phone,I___asleep.A.must be B.must have been C.should be D.should have been
英語人氣：571 ℃時間：2019-11-10 16:10:11
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