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

A.what to do itB.how to do it

C.how to doD.to do what

【答案】B

【解析】

句意:這個數(shù)學(xué)題不難,但是他不知道怎么做。

考查特殊疑問詞+to do不定式。特殊疑問詞后需跟to do不定式,what可以作賓語,how可以作方式狀語,這里是及物動詞do,后缺賓語,所以是what to do或者how to do it,故選B。

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