摘要：31．-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
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— 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.
— Keep looking. _____ is sure to turn up.
[ ]
A. One
B. It
C. That
D. This
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B. It
C. That
D. This