【题目】Here are two pairs of shoes, ______ you may choose.
A.both of them
B.either of them
C.any of which
D.either of which

【答案】D
【解析】考查单词辨析。因为either是两个中的任意一个，any指三者或更多中的任意一个，若选B，则为两个句子，不符合句法构成。故选D。