An interesting suggestion on how to measure the temperature on the moon has been .A. put o

问题补充：

An interesting suggestion on how to measure the temperature on the moon has been .

A. put on

B. put out

C. put down

D. put forward

答案：

A. put on

B. put out

C. put down

(答案→)D. put forward

解析：考查短语辨析。put on穿；put out出版，扑灭；put down镇压；put forward提出。Put forward a suggestion提出建议。根据句意选D。