单项选择题

He was so absorbed（）his work that he didn't notice me entering his room.

A．at
B．on
C．for
D．in

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单项选择题

Cotton output was（）than last year.

A．20 percent high
B．20 percent higher
C．20 percent highest
D．higher 20 higher

单项选择题

The number of cell phones（）increased dramatically in the past few years.

A．have
B．are
C．has
D．is

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