Before the bridge was built the river the villagers had to take a boat to the other side

问题补充：

Before the bridge was built the river, the villagers had to take a boat to the other side.

A. in

B. beside

C. across

D. along

答案：

A. in

B. beside

(答案→)C. across

D. along

解析：A项在……里；B项在……旁边；C项横过，穿过；D项沿着，循着。桥穿过河之前，村民必须乘船到另一边。C项符合题意。