It is silly you to give up to America for further study.A. for to goB. for goingC. of

问题补充：

It is silly you to give up to America for further study.

A. for, to go

B. for, going

C. of, to go

D. of, going

答案：

A. for, to go

B. for, going

C. of, to go

(答案→)D. of, going

解析：for为了表示目的原因等，of ……的表示属性所有等，give up doing sth放弃做某事，根据题意选D。放弃去美国进修的机会，你太傻了。