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There are so many interesting toys that I can't decide ___.A

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There are so many interesting toys that I can't decide ___.A,to buy which.B.
There are so many interesting toys that I can't decide ___.
A,to buy which.B.which to buy C.to buy what D.what to buy.
选B,为什么不能选D
B.which to buy 是对的.
题目隐含着选择的范围,故要用which,不能用what.
再问: 可我觉得which one to buy 才对啊 那D什么时候可以用
再答: 没错,which one to buy 也对.which=which one 。 没有选择的范围,就用what。