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
It's cold outside. You'd better ________ your coat.
A． to put on
B． put on
C． are putting
单项选择题
My father sent me ________stamps last week.
A． two hundreds forty two
B． two hundreds and forty-two
C． two hundred and forty-two
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