An important lecture ______tomorrow, the professor has to stay up late into the night to prepare for it.

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问题 An important lecture ______tomorrow, the professor has to stay up late into the night to prepare for it.

选项 A、to be given
B、will be given
C、is to be given
D、given

答案A

解析 逗号前后分句缺乏连词,且主语与谓语均不一致,因此前半句应采取独立主格结构,构成句子的原因状语,相当于As an important lecture will be given tomorrow,故A为正确答案。D为过去分词作后置定语,不符合语境。
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