The plan just because people were unwilling to co-operate.
A. broke down
B. pulled down
C. turned down
D. put down
网友回答
(答案→)A. broke down
B. pulled down
C. turned down
D. put down
解析：break down意为“中止，毁掉，压倒，停顿，倒塌”；pull down 意为“摧毁，推翻，使降低，使身体变差”；turn down 意为“拒绝，关小音量，减弱，降低”；put down 意为“放下，拒绝，镇压，削减，记下”。