单项选择题

（）a large group, your tone should be clear and long.

A．When addressing
B．While addressing
C．When you address
D．Upon addressing

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单项选择题
I advised（）, but he turned a deaf ear to me.

A．him to smoke not
B．his not smoking
C．him not to smoke
D．his not to smoke
单项选择题
The output of our factory is now three times（）it was three years ago.

A．what
B．that
C．as
D．which
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