问题
选择题
My mother is always warning me when I go out, "Don't get off the bus ________ it is stopping."[ ]
A. until
B. before
C. while
D. after
答案
答案：C
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My mother is always warning me when I go out, "Don't get off the bus ________ it is stopping."[ ]
A. until
B. before
C. while
D. after
答案：C