The suggestion by the locals proved to be a very constructive one.A. put downB. put for

问题补充：

The suggestion, by the locals, proved to be a very constructive one.

A. put down

B. put forward

C. put out

D. put off

答案：

A. put down

(答案→)B. put forward

C. put out

D. put off

解析：考查短语辨析。A镇压；B提出；C扑灭；D推迟。句意：这个当地人提出的建议证明是一个具有非常建设性的建议。故B正确。