问题
选择题
You must wait ______ line when you are waiting ______ a bus.[ ]
A. on, in
B. in, for
C. in, on
D. on, for
答案
答案：B
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You must wait ______ line when you are waiting ______ a bus.[ ]
A. on, in
B. in, for
C. in, on
D. on, for
答案：B