问题
选择题
Measures must be taken to prevent pollution ________ happily. [ ]
A. from we live
B. for us to live
C. us living
D. from our living
答案
答案：B
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Measures must be taken to prevent pollution ________ happily. [ ]
A. from we live
B. for us to live
C. us living
D. from our living
答案：B