从所给的四个选项中.选出最佳答案 I didn't hear the phone. I asleep. [ ] A．must be B．must have be
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![从所给的四个选项中.选出最佳答案 I didn't hear the phone. I asleep. [ ] A．must be B．must have be](/pic/43_989431.jpg)
从所给的四个选项中，选出最佳答案
I didn't hear the phone. I ______ asleep.
[]
A．must be B．must have been
C．should be D．should have been
试题答案
答案：B