It is still unknown_______ caused the accident last Saturday.
A．thatB．whenC．whatD．how
C
本題考查主語(yǔ)從句。It是形式主語(yǔ)，_______ caused the accident last Saturday是主語(yǔ)從句，引導(dǎo)詞要做caused 的主語(yǔ)， 所以用what。
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