【題目】The old lady didn't knowwhen 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(dāng)房子著火時,那位老太太不知道怎么辦。how是副詞,不能充當(dāng)動詞后的賓語。賓語what to do中what可以充當(dāng)do的賓語,不能用how充當(dāng)。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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