问题
选择题
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
答案：C
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