The villagers have already known ______ we'll do is to build the bridge

问题补充：

单项选择题:

The villagers have already known ______ well do is to build the bridge.

A. this

B. that

C. what

D. which

答案：

答案：C

解析： 分析句子结构可知，空格处引导主语从句并在从句中作do的宾语，四个选项中只有what有这种用法，故选C。