---How clean the classroom is! ---Yes ,I am sure that someone _______it. A.has been cleaning B.has c

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---How clean the classroom is! ---Yes ,I am sure that someone _______it. A.has been cleaning B.has c
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---How clean the classroom is! ---Yes ,I am sure that someone _______it. A.has been cleaning B.has c
---How clean the classroom is! ---Yes ,I am sure that someone _______it. A.has been cleaning B.has c

---How clean the classroom is! ---Yes ,I am sure that someone _______it. A.has been cleaning B.has c
has cleaned
用现在完成时

has cheaned