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：考查动词短语：句意：关于如何测量月球的温度，人们提出了一项令人感兴趣的建议。put forward是“提出”之意，符合语境；而put on是“上演，穿上”；put out是“生产，扑灭”；put down是“写下，记下”。选D。