第一节单项填空(共15小题,每小题1分.满分15分)21. Our bad living habits will destroy the earth. Only by changing ——青夏教育精英家教网——

第一节　单项填空(共15小题；每小题1分，满分15分)

21. Our bad living habits will destroy the earth. Only by changing ______ we live ______save the earth.

A. that, can we　　　B. what, we can　　C. how, can we　　　D. where, can we

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