问题
There are so many foggy days these days. We all want to know .
A:How we can do to prevent it
B:How can we do to prevent it
C:What we can do to prevent it
D:What can we do to prevent it;
B:How can we do to prevent it
C:What we can do to prevent it
D:What can we do to prevent it;
正确答案是：
同类题型
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