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

The Constitution’s vague nature has given it the flexibility to be adapted when circumstances change（）

A．imprecise
B．apparent
C．clear
D．easy

单项选择题

We can no longer tolerate his actions．（）

A．put up with
B．accept
C．take
D．receive

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