Don't throw waste paper everywhere.It's our duty to keep our school_____ A.clean B.cleaing
问题描述：
Don't throw waste paper everywhere.It's our duty to keep our school_____ A.clean B.cleaing
答
keep our school clean.
保持我们校园清洁.
可查查词典.
clean
adj. 清洁的,干净的；清白的vt. 使干净vi. 打扫,清扫adv. 完全地n. 打扫
cleaning
n. 清洗；清除；去污；大败
v. 清洁（clean的ing形式）
使校园保持着怎样的一个状态,怎样的状态,应该用形容词,adj,故选clean.