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-There must be a dozen pens in this house but I can never find one when I need o

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-There must be a dozen pens in this house but I can never find one when I need o

－There must be a dozen pens in this house but I can never find one when I need one.

－Keep looking. ________ is sure to turn up.

[]

A．OneB．ItC．ThatD．This

试题答案

答案：A

解析：

根据句意“继续找吧，总有一支会出现的”，并不是特指哪一支，it, this, that都是特指，只有one是泛指，指one of the pens“其中一支”．

标签：canbuthouseonefind

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