___caused the accident is still a complete mystery.

___caused the accident is still a complete mystery.
a、What
b、 That
c、 How
d、Where
我也知道a对的想问问...为什么that不可以?是因为that不用于句首么?

wyjoey 1年前已收到3个回答举报

临高DJ总站幼苗

共回答了15个问题采纳率：100% 举报

这里的每个选择都可以用在句首.That 的意思是因为,就,该句子用that 读不通.
意外是“什么”造成的还是个谜.只有what 合适.

1年前

4ylh 幼苗

共回答了24个问题举报

简单来说，“What+名词+动词”要充当句中成分，如上句中的what caused the accident 充当句子主语。而that 不能充当句中成分，它只是一个引导词，如：That the earth goes around the sun is known to us all . 这个句子中，主语是“the earth goes around the sun ”，因为一个完整句子不能直接作主...

1年前

丑陋的苏宁幼苗

共回答了1个问题举报

that 可以用于句首，但是不充当句子成分，这个主语从句中缺少了主语成分，所以根句意，应该用what，而不是that.

1年前

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