Only when possible to settle the problem .
A. does the editor come will it be
B. the editor comes will it be
C. has the editor come it will be
D. the editor comes it will be
Not until all the fish died in the river how serious the pollution was .
A. did the villagers realize
B. the villagers realized
C. the villagers did realized
D. didn't the villagers realized
运动应激综合征多发生于训练水平低、经验较少的新手身上。
A. 对
B. 错
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