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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单项选择题
Any person（）to leave the country must first obtain a passport.

A．who decides
B．who decide
C．who he or she decides
D．he or she decided
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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