There are five pairs , but I'm at a loss which to buy.
A. to be chosen
B. to choose from
C. tochoose
D. for choosing
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A. to be chosen
(答案→)B. to choose from
C. tochoose
D. for choosing
解析：此题容易误选C其实应选B。choose 表示选择，其实是指选择出来(pick out)而不是指从……选择，要表示后者的意思，要用 choose from，有时也用 choose among。同样地，下面两例中的介词 from 也不可省略Here are some books for you choose from. 这些书可供你选择。There are too many cakes to choose from. 蛋糕太多了不知要选哪个好