题目内容
The telephone rang but I didn’t hear it. I _________ asleep.
| A．must be | B．ought to have been | C．should be | D．must have been |
D
略
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The telephone rang but I didn’t hear it. I _________ asleep.
题目内容
| A．must be | B．ought to have been | C．should be | D．must have been |