_______caused the accident is still a complete mystery.

A．WhatB．ThatC．HowD．Where

A

解析試題分析：考查主語從句。本句中的主語從句what caused the accident,what引導(dǎo)起主語從句，并在句中做主語。CD項(xiàng)只能在句中做狀語，that引導(dǎo)主語從句，不能充當(dāng)任何成分。句意：導(dǎo)致事故的原因還是一個迷。故A正確。
考點(diǎn)：考查主語從句
點(diǎn)評：主語從句是在復(fù)合句中充當(dāng)主語的從句，通常放在主句謂語動詞之前或由形式主語it代替，而本身放在句子末尾。解答這類題目，關(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過判斷引導(dǎo)詞在從句中所作的成分及意義，來選擇正確的引導(dǎo)詞。連接主語從句的從屬連詞主要有that, if, whether，和疑問詞（what how where when ...)。that引導(dǎo)表示陳述句的主語從句，if和whether，whether...or not引導(dǎo)表示“是否”，引導(dǎo)一般疑問句。連接代詞主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。連接代詞一般指疑問，但what, whatever除了指疑問外，也可以指陳述。連接副詞主要有when, where, why, how, whenever, wherever, however等.

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