why is he feeling down today?because the suggestion he ___has been turned down.

问题描述:

why is he feeling down today?because the suggestion he ___has been turned down.
A.put away
B.put down
C.put up
D.put forward

选D:提出
Why is he feeling down today?because the suggestion he put forward has been turned down.
句子大意:他今天为什么不开心?因为他提出的建议没被采纳.