2. 外语
  3. The classroom is empty now. I think the students (go) ______ to the playground.

The classroom is empty now. I think the students (go) ______ to the playground.

admin2009-07-28  35
问题 The classroom is empty now. I think the students (go) ______ to the playground.
选项
答案must have gone
解析 此处是对过去的情况进行肯定的猜测，用must have done的形式。
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