2. 外语
  3. He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.

He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.

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问题 He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.
选项 A、while
B、when
C、the moment
D、unless
答案B
解析 when“这时(突然)”。常见的搭配有：be doing…when…；be about to do…when…；had done…when…。例如：I was walking in the street when someone called me from behind.我走在街上，突然有人从后边喊我。I was about to go out when he came in.我正要出门，突然他进来了。
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