1.I didn’t hear the phone.I ___ asleep.A.must beB.must have been_英语解答

1.I didn’t hear the phone.I ___ asleep.
A.must be
B.must have been

人气：144 ℃　时间：2019-11-13 01:10:56

解答

B must be 是对现在肯定的猜测“一定”
而must have done是对过去发生的事做肯定的猜测.
我（当时）没有听到电话,我（当时）一定睡着了.