____ 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
what在主语从句中作主语，即作谓语动词caused的执行者。在下面的例句中，that不充当任何成份，只起语法连接作用（因为句子本身不缺成分）：
That the former Iraq president Saddam was captured has been proved. |
举一反三
| The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan. |
| Nobody would stand out admitting the fact, for some reason, they lost the game. |
--- The patient looks much better. is it that has made him he is today?
--- Perhaps the special medicine and his family’s patient care. | A．What; that | B．That; that | C．What; what | D．What; which | A plan has been put forward __ more graduates should go to work in the country| A．when | B．that | C．whether | D．how |
| _____ makes his parents proud is _____ his son has been admitted by Beijing University.| A．That; because | B．That; what | C．What; that | D．What; because |
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