问题补充:
I met a friend of mine I was walking in the park.
A. before
B. when
C. because
D. until
答案:
A. before
(答案→)B. when
C. because
D. until
解析:before在……之前;when当……时;because因为;until直到。句意:当我正在公园散步时,我遇到我的一个朋友。结合语境可知选B。
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