单项选择题

His attention often ______ at lectures, No wonder he failed the exam.

A．branched
B．wondered
C．wandered
D．went out
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单项选择题
The board of the company has decided to ______ its operation to include all aspects of the clothing business.
A．extend
B．enlarge
C．expand
D．amplify
单项选择题
When he arrived, he found ______ the aged and the sick at home.
A．none but
B．none other than
C．nothing but
D．no other than
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