---How clean the window is !---Yes ! It just now .A. has been cleanedB. was cleanedC.

问题补充：

---How clean the window is ! -----Yes ! It just now .

A. has been cleaned

B. was cleaned

C. is cleaned

Dwill be cleaned

答案：

A. has been cleaned

(答案→)B. was cleaned

C. is cleaned

D. will be cleaned

解析：has been cleaned（现在完成时）被打扫过； was cleaned（一般过去时）被打扫了；is cleaned（一般现在时）被打扫；will be cleaned（一般将来时）将被打扫。原句意思是：窗子多么干净啊！是啊，它刚才被打扫了。Just now是过去时的时间状语，本句不能用现在完成时。故选B。