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

A．this 

B．that

C．what 

D．which

C解析：句意：村民們已經(jīng)知道我們要重建這座橋。分析句子結(jié)構(gòu)可知，known后跟賓語從句，省略了連接詞that。此賓語從句中又包含一個(gè)主語從句，主語從句中do缺少賓語，所以用what引導(dǎo)該從句作整個(gè)賓語從句的主語，答案為C項(xiàng)。

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