单项选择题

We are foolish enough still to________these old-fashioned ideas.

A．cling on
B．cling lo
C．cling in
D．cling at
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单项选择题
It was impossible to estimate what types of costly medical advances will be________in coming years.
A．available
B．applicable
C．approachable
D．attainable
单项选择题
Professor Smith________in this famous university for tbree decades by next winter.
A．will work
B．has worked
C．has been working
D．will have workcd
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