◎ 题干
— There must be a dozen pens in the room,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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— There must be a dozen pens in the room,but I can never find one when I need them.— Keep looking. _____is sure to turn up. [ ]A. One B. It C. That D. Thi…”主要考查了你对  【不定代词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。