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.
——Keep looking. ____ is sure to turn up.
A
A 此处one特指上文提到的“the one I need”。
A. One B. It C. That D. This
A. One B. It C. That D. This
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