问题描述：
the man went over to the boy,___him on the shoulder and took him away.
A pat
B patted
C patting
D to pat (为什么不选C,D.请帮我解析一下)
A pat
B patted
C patting
D to pat (为什么不选C,D.请帮我解析一下)
问题解答：
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