问题描述：
9．Most of the people ________ were famous scientists from America .
A．were invited B．had been invited
C．to be invited D．invited
翻译这句话,为什么选D,请详解,
A．were invited B．had been invited
C．to be invited D．invited
翻译这句话,为什么选D,请详解,
问题解答：
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