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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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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It could have saved me some trouble （） about it.

A．had I known
B．I had known
C．did I know
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