单项选择题

The nurse is very tired, ________ she is still working very hard.

A．and
B．but
C．so
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单项选择题
She looks at her mother and her face ________
A．turned red
B．lost
C．was sorry
单项选择题
I’m sure it won’t work. Can’t you come up with a ________ idea
A．best
B．better
C．good
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