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the earth is our home.we must ___the land,air,and water clea

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the earth is our home.we must ___the land,air,and water clean.为什么是keep而不是get
keep sth .clean
保持,表示一种状态.
从 catch up with :赶上,强调动作.
和,keep up with 跟上,保持步调一致,
就可以看出,get /catch 等动词,是强调动作性的.
而keep 可以用于强调状态.
地球是我们的家园,我们必须保持土地,气空,还有水的清洁.
从意思上看keep 好.
再问： 我们必须使土地，气空，还有水清洁起来 这样get也解释的通啊
再答： 有点儿牵强吧。 虽然你说，说得通。 但前面都说了：the earth is our home.地球是我们的家园。 如果像你说：“我们必须使土地，气空，还有水清洁起来” 那不主是已经给污染得不行了么。。。。 那不是矛盾了么，是家园，还这么不珍惜？？？ 所以，从意思，句境上讲，应该是keep . the earth is our home.地球是我们的家园。 这句不是白给的。
the earth is our home.we must ___the land,air,and water clea 单项选择The earth is our house.We must _____ the land,air and wa We are c__ Earth,the land,the air and the water.首字母填空,请问横线上应 The earth is our home and we should p---- it Water is the "life blood"of our earth.Like air and sunshine, 选词填空Water is the"life blood"of our earth．Like air and sunshi 英语翻译Water is the "lifeblood" of our earth.Like air and sunsh 英语翻译And the Earth is our home.We're living on the Earth,and The earth is our home.We must take care of it.Life today is Saving the Earth The earth is our home.we should The earth is our home.We must take it.Life today isearser th the earth is our home.we must take c_______ of it.