the work that___ before building a bridge is to make a good design.A:must do B:is to do C:must be done Dhas been done 选什么?为什么,

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the work that___ before building a bridge is to make a good design.A:must do B:is to do C:must be done Dhas been done 选什么?为什么,

the work that___ before building a bridge is to make a good design.A:must do B:is to do C:must be done Dhas been done 选什么?为什么,
the work that___ before building a bridge is to make a good design.
A:must do B:is to do C:must be done Dhas been done 选什么?为什么,

the work that___ before building a bridge is to make a good design.A:must do B:is to do C:must be done Dhas been done 选什么?为什么,
选C
因为首先工作是被完成所以要用被动语态,就可以排除A和B.
其次这个工作并没有完成所以不能现在完成时,这样就可以排除D.

C
意为在修桥之前必须完成的工作

C:must be done
定语从句,必须在建桥之前做的工作是作好设计。

C
首先考的是宾语从句,先行词是work,然后work是被做,所以用被动语态
再之,通过翻译:在建造这座桥前必须做的工作是去做一个好的设计。
可得答案。

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