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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

答案：A

解析：

主语从句。

标签：isstillaccidentcausedthe

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