Mr. Crossett was made his experiment because of his poor health and old age.
A. give up
B. giving up
C. to give up
D. given up
网友回答
A. give up
B. giving up
(答案→)C. to give up
D. given up
解析：考查动词make的用法。make sb do 让某人做某事，用不带to的不定式做宾补，但是它的被动形式必须加to，故选C，句意：Mr. Crossett被使得放弃他的实验因为他的身体不好和年纪大了。