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英语
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___ he was on holiday he caught a cold.A.When B.While C.As D.At
人气:320 ℃ 时间:2020-04-19 07:05:16
解答
When后可接时间点和时间段,while后只能接时间段,不能接时间点,as表示进展过程,有一边一边的意思,at是指在某个时间点.所以选B
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