题目内容
---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.One B.It C.That D.This
A

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题目内容
---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.One B.It C.That D.This
A