-There must be a dozen pens in this house but I can never find one when I need.
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—There must be a dozen pens in this housebut I can never find one when I need.
—Keep looking. _____________is sure toturn up.
A. One B.It
C. That D.This
试题答案
答案：A
解析：one用来表示泛指，指众多事物或人中的一个，指代可数名词单数。
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