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 precious manuscripts were hopelessly ______ by long exposure in the cold, damp cellar.
A．ruined
B．damaged
C．destroyed
D．harmed
单项选择题
The director was critical ______ the way we were doing the work.
A．at
B．in
C．of
D．with
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