题目内容：

You can keep this book ( ) two month if you can keep it ( ) 选什么?缘由
A.as long as;clean
B.as many as;cleaning
C.as far as;cleaned
Das soon as;being clean

优质解答

选A.
前者表示“长达”,当然也有“只要”的意思
后者,keep后应加形容词或动名词,此处接形容词表示状态：干净.
祝你学习愉快!