__________I see him, he looks sadA.Every now and thenB.Every now and againC.Every so oftenD.Every time
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D解析试题分析:句意: 我每次见到他,他看起来都很难过。A. Every now and then不时地,常常;B. Every now and again偶尔,有时;C. Every so often偶尔,时常;D. Every time每次,每当,在这里是连词,后跟句子,引导的时间状语从句。根据句意故选D。考点:考查连词的用法。