Question

【题目】Many old buildings _____ well because they are our national treasures.

A. have protected B. should be protected C. protected

Answer 1

【答案】B

【解析】句意“一些老的建筑应该被保护，因为他们是我们国家的财富”。主语many old buildings与protect之间为被动，且有情态动词，后用动词原形，故选B。