问题补充：
Peter is my best friend. He often helps with science.
A. me
B. you
C. him
D. her
答案：
(答案→)A. me
B. you
C. him
D. her
解析：句意：Peter是我最好的朋友。他经常在科学上帮助我。”在某方面帮助某人”用”help sb. with sth.”这里只提到了Peter和“我”两个人，而第二句主语是他，那肯定帮助的就是“我”，故选A。
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