问题描述：
You _____drive your car so fast.It's very dangerous.
A.wouldn't B.shouldn' C.couldn't D.mightn't .教材里的答案是B,为什么不能是C.
A.wouldn't B.shouldn' C.couldn't D.mightn't .教材里的答案是B,为什么不能是C.
问题解答：
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