the work that___ before building a bridge is to make a good

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,

asaaa 1年前已收到4个回答举报

4056977 幼苗

共回答了18个问题采纳率：94.4% 举报

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.

1年前

cg930 幼苗

共回答了40个问题举报

C
意为在修桥之前必须完成的工作

1年前

abc006 幼苗

共回答了4个问题举报

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。

1年前

芊芊绿叶幼苗

共回答了536个问题举报

C：must be done
定语从句，必须在建桥之前做的工作是作好设计。

1年前

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