单项选择题

A．on
B．in
C．at
D．by
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单项选择题
What was Alan doing at that time
A． She was taking a rest.
B． She was preparing for an exam.
C． She was taking an exam.
单项选择题
A．explainedB．saidC．toldD．advised
A．explained
B．said
C．told
D．advised
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