____ caused the accident is still a complete mystery.
A．WhatB．ThatC．HowD．Where
A
what在主語從句中作主語，即作謂語動詞caused的執(zhí)行者。在下面的例句中，that不充當任何成份，只起語法連接作用（因為句子本身不缺成分）：
That the former Iraq president Saddam was captured has been proved.
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