单项选择题

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

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
you got Ul5 late won't be a sufficient excuse for your being late for class（）

A．It is
B．That
C．Because
D．What
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