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It is still unknown caused the accident last SaturdayA.thatB.whenC.whatD.how

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It is still unknown caused the accident last SaturdayA.thatB.whenC.whatD.how

It is still unknown_______ caused the accident last Saturday

A.that

B.when

C.what

D.how

试题答案

C

本题考查主语从句。It是形式主语，_______ caused the accident last Saturday是主语从句，引导词要做caused 的主语， 所以用what。

标签：unknowncausedtheitis

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