问题补充:
—What should we do first if we want to develop our village?
—A lot of new roads, I think.
A. have to build B. must build C. must be built
答案:
解析:本题考查的是被动语态,情态动词的被动语态结构为主语+情态动词+be +动词的过去分词,故选C
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