题目内容
—There must be a dozen pens in this house but I can never find one when I need it.( )
—Be patient. ________ is sure to turn up.
A. One B. It C. This D. That
A
考查代词的用法。此处表示泛指,代替单数可数名词,故用one。it用来代指上文提到的同一个事物。
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