I had a really hard time studying science this term.A. toB. withC. inD. on

问题补充：

I had a really hard time studying science this term.

A. to

B. with

C. in

D. on

答案：

A. to

B. with

(答案→)C. in

D. on

解析：表示在什么上很辛苦可用have a hard time（in）doing sth，故本题选C。