14.The old man didn’t know _______ when the house caught fire .
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
A.what to do it B.how to do C.how to do it D.what to do 选哪个 为什么
英语人气：744 ℃时间：2019-11-14 15:00:57
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B 因为这是一个从句,不知道怎么做就是how to do我认为C或D都行呀 how to do为什么不加it1.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how2.这里的从句是when the house caught fire ，而不是空上的词。
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