You must wait ______ line when you are waiting ______ a bus.[ ]A. on, in B. in, for C. in, on D. on,
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题目简介
You must wait ______ line when you are waiting ______ a bus.[ ]A. on, in B. in, for C. in, on D. on,
题目详情
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B. in, for
C. in, on
D. on, for
答案