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
Of all the boys in the class, Steven is______.
A．the tallest
B．the taller
C．tall
单项选择题
Neither Peter nor Jack ________in this factory.
A．work
B．to work
C．works
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