单项选择题

Look! The children ______ on the ground happily. Let's join them.

A．play
B．have played
C．are playing
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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
单项选择题
If you fly to Malaysia(马来西亚)from Hong Kong, you'll have to stop in Thailand(泰国) ______.
A．by the way
B．on the way
C．in the way
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