I didn't hear the phone.I _____ asleep.A.must beB.must have beenC.should have beenD.could have been

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I didn't hear the phone.I _____ asleep.A.must beB.must have beenC.should have beenD.could have been

I didn't hear the phone.I _____ asleep.A.must beB.must have beenC.should have beenD.could have been
I didn't hear the phone.I _____ asleep.
A.must be
B.must have been
C.should have been
D.could have been

I didn't hear the phone.I _____ asleep.A.must beB.must have beenC.should have beenD.could have been
B