2. 外语
  3. The examination____________(一定很难)since none of the students passed.

The examination____________(一定很难)since none of the students passed.

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问题 The examination____________(一定很难)since none of the students passed.
选项
答案must have been very difficult
解析 对过去的肯定推测使用“must+完成时”形式。
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大学英语四级

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