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

A．had I known
B．I had known
C．did I know
D．I knew
单项选择题
Hardly （） the room when I found a letter on the floor.

A．I had entered
B．had I entered
C．I entered
D．did I enter
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