题目内容
【题目】—Look! How clean the classroom is!
—Yes. I’m sure someone _______ it up.
A. cleans B. is cleaning C. will clean D. has cleaned
【答案】D
【解析】句意：——看，教室多么干净啊！——是啊。我确定有人打扫过了。根据句意和语境判断，现在教室很干净了，说明有人打扫过了。应该用现在完成时。故选D。
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题目内容
【题目】—Look! How clean the classroom is!
—Yes. I’m sure someone _______ it up.
A. cleans B. is cleaning C. will clean D. has cleaned
【答案】D
【解析】句意：——看，教室多么干净啊！——是啊。我确定有人打扫过了。根据句意和语境判断，现在教室很干净了，说明有人打扫过了。应该用现在完成时。故选D。