—How clean the window is!—Yes itjust now.A cleaned B has been cleaned C was cleaned

问题补充：

—How clean the window is!

—Yes, itjust now.

A、cleaned B、has been cleaned C、was cleaned

答案：

解析：考查动词时态和语态。句意为：-----窗户多么干净啊！-----是啊，刚才打扫过的。从时间状语just now“刚才”可知，应该用一般过去时态；又因为window是动词clean的承受者，所以要用被动语态。结合两点，故选C。