单项选择题

Never before (I have) seen anyone (who has) the skill (John has) when he (repairs) cars.

A．I have
B．who has
C．John has
D．repairs
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单项选择题
(Thirteen hundred) medical professionals, (all of which) have been trained to treat drug dependency, (attended) the annual convention (sponsored) by a society.
A．Thirteen hundred
B．all of which
C．attended
D．sponsored
单项选择题
To control (quality) and (making) decisions (about) production are among the many responsibilities of an (industrial) engineer.
A．quality
B．making
C．about
D．industrial
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