【題目】 When and where this took place _____ still unknown.

A. is B. has

C. were D. are

【答案】A

【解析】

試題分析：考查系動詞。句意：這個發(fā)生在何時何地還不清楚。主語從句作主語，謂語動詞用單數(shù)形式，故選A。

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