单项选择题

A．to
B．at
C．of
D．in
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单项选择题
A．skillB．skillfulnessC．skilledD．skillful
A．skill
B．skillfulness
C．skilled
D．skillful
单项选择题
A．Students with a proper ID can check any book out.B．Only the students with special permission can check out reference books.C．Only professors can check out the reference books.D．The reference books are not allowed to be checked out.
A．Students with a proper ID can check any book out.
B．Only the students with special permission can check out reference books.
C．Only professors can check out the reference books.
D．The reference books are not allowed to be checked out.
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