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

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

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

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

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