【单选题】—There must be a dozen pens in this house but I can never find one when I need them. —Keep looking. ______ is sure to turn up.
A．One
B．It
C．That
D．This
网考网参考答案：A
网考网解析：
[考点] one用于指代前面提到过的单数可数名词
[解析] 根据上文提到“find one”，故下文中也应填one，表示泛指。
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