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I didn’t hear the phone．I ______ asleep．

       A．can be       B．must have been      C．must be      D．should have been

I didn’t hear the phone．I ______ asleep．

       A．can be       B．must have been      C．must be      D．should have been

I didn’t hear the phone．I ______ asleep．

A．can be         B．must have been           C．must be        D．should have been