单项选择题

Fifty dollars （） a big sum of money for a child.

A．are
B．is
C．being
D．having been

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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
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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