问题
选择题
— What should we do first if we want to develop our country?
— A lots of roads , I think. [ ]
A. have built
B. must be built
C. must build
D. have to build
答案
答案：B
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— What should we do first if we want to develop our country?
— A lots of roads , I think. [ ]
A. have built
B. must be built
C. must build
D. have to build
答案：B