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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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
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
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