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I didn't hear the phone. I asleep. [ ] A.must beB.should have been C.could beD.m

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I didn't hear the phone. I asleep. [ ] A.must beB.should have been C.could beD.m

I didn't hear the phone. I ________ asleep.

[]

A.must beB.should have beenC.could beD.must have been

试题答案

答案:D