I always help my sister her history.A. toB. withC. forD. of

问题补充：

I always help my sister her history.

A. to

B. with

C. for

D. of

答案：

A. to

(答案→)B. with

C. for

D. of

解析：句意：我总是帮助我的妹妹学习历史。A. to 向； B. with 用； C. for为了； D. of的。help sb. with sth.帮助某人做某事。故选B。