He must have overslept, or he ______ then.

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问题 He must have overslept, or he ______ then.

选项 A、would have been here
B、had to be here
C、should be here
D、would be here

答案A

解析 句意:他睡过了头,否则,他应该已经来了。这里是完成时态虚拟语气。
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