It’s difficult us to remember new words.A. ofB. toC. forD. on

问题补充：

It’s difficult us to remember new words.

A. of

B. to

C. for

D. on

答案：

A. of

B. to

(答案→)C. for

D. on

解析：

试题分析: 句意：对我们来说记新单词很困难。it’s +adj+ for sb to do，对某人来说做某事是……的，固定句型，故选C.