初中英语的单选题The foggy days are more and more.We don’t know

初中英语的单选题
The foggy days are more and more.We don't know --------.
A.what we can do to prevent it
B.how we can do to prevent it

A,毋庸置疑,如果是后者,那应该是 how we can do it to prevent ,因为 to do 后要加宾语

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