单项选择题

Linton looked as though he（）ill for a long time.

A．were
B．was
C．has been
D．had been

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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
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
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