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问题: 选什么? 为什么? 请详细解释一下!

—Was he present at the wedding ?
--He ________not have attended it ,for he was busy repairing his computer during that time .
A. can B. might C. should D. must

解答:

—Was he present at the wedding ?
--He ________not have attended it ,for he was busy repairing his computer during that time .
A. can B. might C. should D. must
选A
他昨天去参加婚礼了吗?
他不可能去了,因为那个时候他正在忙着修理他的电脑呢