what we should do first if we want to develop our village?a lot of new roads____ ,i thinka:must built b:have to built itc:must be done builtd:have builting 为什么

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whatweshoulddofirstifwewanttodevelopourvillage?alotofnewroads____,ithinka:mustbuiltb:havetobuiltitc:

what we should do first if we want to develop our village?a lot of new roads____ ,i thinka:must built b:have to built itc:must be done builtd:have builting 为什么
what we should do first if we want to develop our village?
a lot of new roads____ ,i think
a:must built
b:have to built it
c:must be done built
d:have builting
为什么

what we should do first if we want to develop our village?a lot of new roads____ ,i thinka:must built b:have to built itc:must be done builtd:have builting 为什么
好像四个都不对,这里应该用被动语态.应该填must be built.

must be built