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The maths problem was not difficult, but...

The maths problem was not difficult, but he didn’t know ______.

A.what to do it B.how to do it

C.how to do D.to do what

 

B 【解析】 句意:这个数学题不难,但是他不知道怎么做。 考查特殊疑问词+to do不定式。特殊疑问词后需跟to do不定式,what可以作宾语,how可以作方式状语,这里是及物动词do,后缺宾语,所以是what to do或者how to do it,故选B。
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