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
We find it impossible to ______ with the latest safety regulations.
A. accord
B. unify
C. obey
D. comply
单项选择题
One of the requirements for a fire is that the material ______ to its burning temperature.
A. be heated
B. is heated
C. would be heated
D. to heated
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