单项选择题

No increase in output can be expected ______ a new assembly line is installed.

A．if
B．when
C．unless
D．where
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单项选择题
He is the last man ______ a bride.
A．to accept
B．accepting
C．accepts
D．accepted
单项选择题
Every man is not polite, and all are not born ______.
A．a gentleman
B．the gentleman
C．gentlemen
D．the gentlemen
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