单项选择题

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

A．valued
B．valueless
C．invaluable
D．usable
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单项选择题
Before the tourists set off, they spent much time setting a limit ______ the expenses of the trip.
A．for
B．in
C．to
D．about
单项选择题
Frank almost never received any education, ______
A．would he
B．did he
C．didn’t he
D．wouldn’t he
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