Thoughtheaccidenthappenedinthedaytime,thewitnesseswere...

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Though the accident happened in the daytime, the witnesses were very difficult　　　.

A. to be found B. to find

C. finding D. being found

【解析】选B。考查固定句式。句意: 尽管事故发生在白天, 但很难找到目击者。“主语+ be +形容词+不定式”为固定句式。该句式中, 在后面作状语修饰前面作表语的形容词的动词不定式要用主动形式表被动含义, 故选B。