单项选择题

He was so _________ on his book that he didn't find her come in.

A．intent
B．absorbed
C．engrossed
D．devoted
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单项选择题
_________ some mammals came to live in the sea is not known.
A．Which
B．Since
C．Although
D．How
单项选择题
His heroic public image was seriously _________ by the rumor.
A．detracted
B．distracted
C．retracted
D．subtracted
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