it's a pleasant way to help keep our city clean 为什么有两个动词不是一个

近义词辨析It's a ____ way to keep our city clean. A. pleasant B. It's a p____ way to help keep our city clean and tidy. 近义词辨析It's a ____ way to keep our clean.A.pleasantB.pleasedC. It is our duty to keep our school clean keep 后不是接动名词吗为什么是cle i will help clean up the city parks 为什么不是i will help to clea we must keep our city ( )every day.yes,miss gao A.clean B.to Must wu do shomthing to keep our city clean?_______ a.yes we 英语作文：How to keep our city clean? I think it's our duty to keep our environment clean and tidy It is our duty to keep our city clean.中文该怎么翻译?它的同义句是什么? street cleaners help keep our city__.a,clean b,cleaning c,to It's hard to keep the house clean with tree kids .为什么不用clean