单项选择题

(Should) John resign and Henry (succeed) him, we (would have had) a (more) vigorous leadership.

A．Should
B．succeed
C．would have had
D．more
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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
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
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