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When and where this took place _____ still unknown.

A．isB．hasC．wereD．a(chǎn)re

A

解析試題分析：考查主謂一致：句意：這在什么時(shí)候什么地方發(fā)生的還不知道。主語(yǔ)是單個(gè)的主語(yǔ)從句的時(shí)候謂語(yǔ)用單數(shù)，unknown是形容詞，前面用be動(dòng)詞，選A。
考點(diǎn)：考查主謂一致

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