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

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单项选择题
Students at colleges in large cities ran into （） debts because it was easier for them to find part-time jobs than those in rural areas.

A．little
B．less
C．few
D．fewer
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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