单项选择题

It was not until almost a century （） blacks began to demand their rights as American citizens.

A．when
B．since
C．that
D．which

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单项选择题
The schools （） black children went were simply not good enough.

A．to which
B．to that
C．in which
D．in that
单项选择题
The females in the rat population were （） by the high population density.

A．most seriously affected
B．the most seriously affected
C．the most serious affected
D．the serious most affectect
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