I was just coming out of the sea after a swim ______ I stepped on a sharp stone and cut my foot.

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问题 I was just coming out of the sea after a swim ______ I stepped on a sharp stone and cut my foot.

选项 A、then
B、as
C、when
D、while

答案C

解析 句意是“我游完泳刚要从海里出来时踩到一块尖石头上,把我的脚割破了。”when,引导的时间状语从句,其从句中的动词可以是终止性动词,也可以是延续性动词。然而while和as引导的从句,其从句中的动词必须是延续性动词。所以本题的正确答案选C。[拓展]when, while与as的用法区别:when说明从句的动作和主句的动作可以是同时发生,也可以是先后发生;while和as则强调主从句两个动作同时发生。例:While she was typing the letter, the telephone rang.当她在打那封信时,电话响了;when和while还可作并列连词。when表示“在那时”,while表示“而。却”,表对照关系。例:He was riding a bike when suddenly he fell down and hurt himself.他骑车时,突然摔倒了,把自己弄伤了。I drink black coffee while he prefers it with cream.我喜欢黑咖啡,而他喜欢加奶油的。
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