Our classroom is very clean. Do you know who＿＿cleaned it﹖A. was it thatB. it was thatC. wa

问题补充：

Our classroom is very clean. Do you know who＿＿cleaned it﹖

A. was it that

B. it was that

C. was it who

D. he was

答案：

A. was it that

(答案→)B. it was that

C. was it who

D. he was

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