the trees can keep the air______
1.clean 2.cleaner 3.cleanest 4.the cleanest
人气：229 ℃ 时间：2020-03-25 09:59:06
解答
这里选择1,clean
意思：树可以保持空气清洁
这里就是原形,没有比较的意思,所以直接clean
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