_________ caused the accident is still a mystery.
A．HowB．WhatC．ThatD．Where
B

試題分析：句意：什么事情引起的這個(gè)事故仍然是一個(gè)謎。這里是what引起的主語從句，what在從句中作主語，從句作主語時(shí)，謂語動(dòng)詞一般情況下應(yīng)該單數(shù)；that在主語從句中，不作成分；how與where不能在從句中做主語，因?yàn)檫@里缺少的是主語從句的連詞，并且連詞在從句中作主語，故選B。
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