单项选择 较易0.85 引用1 组卷15
We must do whatever we can to ________ our environment getting worse and worse.
A.separate | B.keep | C.prevent | D.guard |
2020高三上·全国·专题练习
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We must do whatever we can to ________ our environment getting worse and worse.
A.separate | B.keep | C.prevent | D.guard |
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