单项选择题

In the background was that eternal hum.（）

A．long
B．never-ending
C．boring
D．extensive

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单项选择题

These are the motives for doing it.（）

A．reasons
B．excuses
C．answers
D．replies

单项选择题

Gambling is lawful in Nevada.（）

A．enjoyable
B．irresistible
C．legal
D．profitable

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