Mr. Uemura declined to ( ) on rumors about how many medicines the drug manufacturer had in development.

A. comment

B. commentary

C. comments

D. Commenting

【答案】A。固定搭配。decline to do sth“拒绝做某事”，所以后面需要加上动词原形，只有A选项是动词原形。另comment on sth“对某事发表意见，评论某事”也是固定搭配。