19.I didn't hear the phone .I ______asleep .19.I didn't hear the _英语解答

19.I didn't hear the phone .I ______asleep .
19.I didn't hear the phone .I ______asleep .
A.must be
B.must have been
C.should be
D.should have been
选B为什么
为什么不选A

人气：180 ℃　时间：2020-01-18 21:00:40

解答

B我一定是睡着了刚才.must表示一定
must have been 这里不是现在完成时,因为must后必须用动词原形,所以不用had been,这里表示我之前一定睡着了.