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caused the accident is still a complete mystery.? A.What B.That C.How D.Where?

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caused the accident is still a complete mystery.? A.What B.That C.How D.Where?

__________ caused the accident is still a complete mystery.?

A.What                B.That                  C.How                 D.Where?

试题答案

A?

解析:

此题考查what引导名词性从句作主语。?

标签：isstillaccidentcausedthe

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