单项选择题

You can stay in my room ______ you promise not to use the computer.

A．so far as
B．except
C．unless
D．provided
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单项选择题
We must study English well, no matter ______ difficult it is.
A．what
B．however
C．how
D．that
单项选择题
The boss thought that young man was well ______ to do the job.
A．able
B．qualified
C．skillful
D．capable
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