[题目] caused the accident is still a complete mystery. WhatB. That C. HowD. Where 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】_________ caused the accident is still a complete mystery.

WhatB. That

C. HowD. Where

【答案】A

【解析】句意：这起事故的原因还完全是个谜。what引导主语从句。

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