单项选择题

I have two sisters, ______ is a doctor, and ______ is a nurse.

A． one... another
B． one... the other
C． one... other
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单项选择题
Look! The children ______ on the ground happily. Let's join them.
A． play
B． have played
C． are playing
单项选择题
Lin Tao was not running ______.
A． enough fast
B． fast enough
C． fast to
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