caused the accident is still a complete mystery.A．WhatB．ThatC．HowD．Where
题型：不详难度：来源：
| caused the accident is still a complete mystery. |
答案
| A |
解析
试题分析：原句意思是，什么造成了这次事故依然是个谜。分析句子结构，这是一个主从复合句，包括一个主语从句。主语从句中缺主语，所以只能用 what，故用答案为A。
点评：这是一个主从复合句，包括一个主语从句。主语从句中缺主语，所以能用 what。 |
举一反三
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