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题目
题型:不详难度:来源:
It is still unknown_______ caused the accident last Saturday.
A.thatB.whenC.whatD.how

答案
C
解析
本题考查主语从句。It是形式主语,_______ caused the accident last Saturday是主语从句,引导词要做caused 的主语, 所以用what。
核心考点
试题【It is still unknown_______ caused the accident last Saturday.A.thatB.whenC.whatD】;主要考察你对名词性从句等知识点的理解。[详细]
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