2. 外语
  3. Mary did not come to the party last night, and I think she______too much work to finish.

Mary did not come to the party last night, and I think she______too much work to finish.

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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 表示对过去行为的推测时，must后面要用完成式。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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