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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