单项选择题

They are talking about the people and the things _______ they saw on their way home.

A．which
B．that
C．those
D．who
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单项选择题
The policeman put down the phone, _______ with a smile on his face.
A．satisfied
B．satisfying
C．to be satisfied
D．having satisfied
单项选择题
A dolphin breathes through its （）.

A．mouth
B．ears
C．skin
D．blowhole
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