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
He ought to attend the meeting, ______
A．should he
B．ought he
C．shouldn’t he
D．oughtn’t he
单项选择题
Bread and butter ______ . liked by Westerners.
A．is
B．are
C．were
D．be
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