单项选择题

-- Why do you think he is a liar
-- We have proved（）many times.

A. so
B. as much
C. him
D. it

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单项选择题

The crime rate has continued to rise in American cities despite efforts on the part of both government and private citizens to curb（）

A. them
B. its
C. him
D. it

单项选择题

（）to do the work, I should do it some other day.

A. If were I
B. I were
C. Were I
D. Was I

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