单项选择题

We must study English well, no matter ______ difficult it is.

A．what
B．however
C．how
D．that
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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
单项选择题
It is requested that every student ______ a paper on sustainable development.
A．writes
B．wrote
C．writing
D．write
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