---What should we do first if we want to develop our village?---Lots of new roads I thin

问题补充：

---What should we do first if we want to develop our village?

---Lots of new roads , I think.

A. must built B. can build C. must be built

答案：

解析：此题考查含有情态动词的被动语态的基本结构，情态动词+be+过去分词

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