In the 1960s, a lot of old city walls in Beijing        because people thought them useless.

• A.pull down
• B.have pulled down
• C.were pulled down
• D.had pulled down

答案

正确答案：C

知识点：被动语态  

由时间状语in the 1960s可知用一般过去时；a lot of old city walls是动作的承受者，应当用被动语态，即were pulled down，选C。

略

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