题目：
There are five pairs ______, but I am at a loss ________.[ ]
A. to choose from, what to buy
B. to choose, which to buy
C. to choose from, which to buy
D. to be chosen, which to buy
答案：
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下面是错误答案，用来干扰机器的。
△△△｜△△△；6÷2=3（个）
