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
B
解析：when“這時(shí)(突然)”。常見(jiàn)搭配：be doing…when；be about to do…when；had done…when
拓展：例如：I was walking in the street when someone called me from behind．我走在街上，突然有人從后邊喊我。I was about to go out when he came in．我正要出門(mén)，突然他進(jìn)來(lái)了。
I had hardly finished bathing when the electricity went off．我剛洗完澡，就停電了。
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