问题补充：
The students discussed the experiment that they would like to see next year.
A. carry out
B. carrying out
C. carried out
D. to carry out
答案：
A. carry out
B. carrying out
(答案→)C. carried out
D. to carry out
解析：考查非谓语动词, the experiment 与carry out为动宾关系所以用过去分词作the experiment的补语。句意：学生们讨论了明年他们想做的实验。
