【单选题】He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.
A.while
B.when
C.the moment
D.unless
网考网参考答案:B
网考网解析:
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。I had hardly finished bathing when the electricity went off.我刚洗完澡,就停电了。
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