问题
选择题
I warned him of the slippery road, but he fell on fours ________ I finished my words.[ ]
A. as
B. before
C. until
D. since
答案
答案：B
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I warned him of the slippery road, but he fell on fours ________ I finished my words.[ ]
A. as
B. before
C. until
D. since
答案：B