14.The old man didn’t know _______ when the house caught fir

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14.The old man didn’t know _______ when the house caught fire .
A.what to do it B.how to do C.how to do it D.what to do 选哪个为什么

B 因为这是一个从句,不知道怎么做就是how to do
再问：我认为C或D 都行呀 how to do 为什么不加it
再答： 1.how的意思是怎么样，what 的意思是什么，根据题意可知，就应该用how 2.这里的从句是when the house caught fire ，而不是空上的词。

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