单项选择题

I find this treatment very ______ to my health.

A．advisable
B．beneficial
C．invaluable
D．worthy
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单项选择题
Our general manager______ ill yesterday and now he is lying in hospital.
A．took
B．caught
C．fell
D．set
单项选择题
Some hard plastics can be______ metals in manufacturing machine parts.
A．substituted for
B．taken the place of
C．replaced in
D．given way to
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