单项选择题

The _______ crown jewels are kept in the Tower of London.

A．valued
B．valueless
C．invaluable
D．worthy
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单项选择题
The more arid the continent, the less the amount of annual precipitation _______.
A．runs off that
B．runs it off
C．that runs it off
D．that runs off
单项选择题
The impact of Thoreau's On the Duty of Civil Disobedience might not have been so far- reaching _______ , for Elizabeth Peabody, who dared to publish the controversial essay.
A．it not having been
B．it is not being
C．had it not been
D．it it not being
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