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The examination____________(一定很难)since none of the students passed. must have be
The examination____________(一定很难)since none of the students passed. must have be
游客
2023-07-22
50
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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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