Our professor should have attended the evening party last night; he__________too much work to do.

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问题 Our professor should have attended the evening party last night; he__________too much work to do.

选项 A、must have had
B、had to have
C、must have
D、had had

答案A

解析选项A表示“一定做过…”，是对过去情况的肯定推测。根据句意，教授昨晚本应该参加晚会，却没有参加，一定是昨晚有很多工作要做。故选A。

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A类竞赛（研究生）

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