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【题目】He flashed me a quick smile but rapidly swallowed it___________ he saw my expression.

A.when.B.unless.C.ifD.until

【答案】A

【解析】

考查时间状语从句。句意:他对我很快地笑了一下,但当看到我的表情时,他马上就忍住了。A. when.……时;B. unless.除非;C. ifD. until直到……为止。文中表示“当……时”,引导时间状语从句,故选A。

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