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

游客2023-10-07  30

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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