we mustn't pollute rivers or cut down forests.we should try__ __ _英语解答

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

人气：202 ℃　时间：2020-02-25 20:18:20

解答

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.