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
网友回答
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。