问题
选择题
—Why didn't you try your best to get on the bus?
—I tried to, but ________ I could, it started moving.[ ]
A. until
B. when
C. before
D. after
答案
答案：C
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—Why didn't you try your best to get on the bus?
—I tried to, but ________ I could, it started moving.[ ]
A. until
B. when
C. before
D. after
答案：C