we mustn't pollute rivers or cut down forests.we should try __(保持地球的干净）

分类: 作业答案 • 2021-12-28 18:46:53

问题描述：

we mustn't pollute rivers or cut down forests.we should try__ __ __ __ __(保持地球的干净）
the children found it interesting__ __ __（玩）monkeys

答

1. to keep the earth clean
2.to play with为什么clean不在keep的后面有keep clean的用法但表示：保持。。的清洁时，需keep+sth.+clean.

we mustn't pollute rivers or cut down forests.we should try__ __ __ __ __(保持地球的干净）