On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading "Boston".

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问题 On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading "Boston".

选项 A、where
B、which
C、that
D、when

答案D

解析 主句用过去进行时,而从句是由when引导的时间状语从句,表示当主语正在做一件事情时,另外一件事情发生了。根据句意,选项D正确。
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