--What a clean kitchen!--Yes and it by my mother every Saturday.A. cleans B. is cleaned

问题补充：

--What a clean kitchen!

--Yes, and it by my mother every Saturday.

A. cleans B. is cleaned C. has cleaned

答案：

解析：句意：多么干净的厨房啊！——是的，我母亲每天打扫它。结合语境可知下文描述的是客观性动作，故用一般现在时态，主语是动作对象，故用被动语态，选B。