【題目】The old lady didn’t know_____when the house caught fire.

A. how to do B. how to do it

C. what to do D. what to do it

【答案】C

【解析】句意:當房子著火時,那位老太太不知道怎么辦。how是副詞,不能充當動詞后的賓語。賓語what to dowhat可以充當do的賓語,不能用how充當。故排除AD兩項。it代指前面出現(xiàn)的事物,本句中it沒有要指代的事物,故排除B項。故選C。

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