If you are interested in any one of the books on the shelf ,I’ll buy and send to you as a gift.
A. it
B. one
C. them
D. some
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(答案→)A. it
B. one
C. them
D. some
解析:句意:如果你对书架上的任何书感兴趣的话,我会买下它,并送给你做为礼物。这里需要代词指代“你感兴趣的那本书”,就是特指同类同物,用it,one是泛指可数名词单数,them“它们”,some“一些”,所以选A。