单项选择题

"Not until science became prominent ______ be abolished," some people argue.

A．did slavery come to
B．slavery to
C．had slavery come to
D．that slavery came to
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单项选择题
George enjoys talking about people's private affairs. He is a ______.
A．solicitor
B．coward
C．gossip
D．rebel
单项选择题
The lure started on the first floor of the hospital, ______ are elderly and weak.
A．many of whose patients
B．many of which patients
C．many of it patients
D．many patients of whom
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