Mary did not come to the party last night, and I think she ________ too much wor

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问题 Mary did not come to the party last night, and I think she ________ too much work to finish.

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

答案 C

解析本题考查虚拟语气的用法。情态动词后接完成式，可以表示对过去情况的推测或与事实相反的虚拟语气。本题中推测的事情发生的时间为last night，因此需要使用“must+完成式”的形式，故确定答案为C。

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