your letter , I would have started off two days ago.
A. If I received
B. Should I receive
C. If I could have received
D. Had I received
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运动应激综合征好发时间描述不正确的是（）
A. 训练或比赛中
B. 训练或比赛后即刻发生
C. 训练或比赛后短时间内发生
D. 训练或比赛后1小时后发生
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
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