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问题

He didn’t show up at the party yesterday. He _____in the lab.


He didn’t show up at the party yesterday. He _____in the lab.

A、would have been busy working

B、must be busy to work

C、must have been busy working

D、must be busy wording

请帮忙给出正确答案和分析,谢谢!

参考答案
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