----What will we do if we want to develop our village ?
---- A lot of roads . I think .
A. have to build
B. are build
C. must be built
D. will build
网友回答
A. have to build
B. are build
(答案→)C. must be built
D. will build
解析：句意：如果我们想要发展我们的村庄，我们应该做什么？——必须修许多公路，我认为。结合语境可知下文主语为动作的对象，故用被动语态。选项B描述的是客观状态，语义不符。故选C。