问题补充:
In order to make Chongqing more beautiful, lots of trees on both sides of the street.
A. should build
B. have built
C. must be built
D. will build
答案:
A. should build
B. have built
(答案→)C. must be built
D. will build
解析:本题需要的是被动语态,主语是被发生的,是动作的承受者,只有C为被动语态结构,其余的选项,都是主动语态,故选C