单项选择题

It was not a grand occasion, so we were allowed to wear _____ clothes.

A．formal
B．causal
C．simple
D．plain
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单项选择题
The company has promised to _____ no efforts on the cooperation with us.
A．spare
B．save
C．share
D．make
单项选择题
She was so _____ in reading the novel that she didn’t hear the bell ringing.
A．concentrated
B．absorbed
C．attracted
D．drawn
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