Question

—People find it hard to get across the river．
—I think at least two bridges         over it．

A．need

B．are needing

C．will need

D．should be needed

Answer 1

D

本题的含义是在河上至少需要两座桥，本题桥在从句作主语，是动作的承受者，故被动结构，结构为be+过去分词，need的过去分词是needed，故选D。