单项选择题

In 1999, the government spent about $ 39 billion to （）

A．improve the prison conditions
B．keep men and women in prison
C．build houses for prisoners
D．maintain the prisons

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单项选择题
Which of the following statements about Leopold and Rudolph Blaschka is TRUE（）

A．They were brothers.
B．They were artists.
C．They were florists.
D．They were farmers.
单项选择题
In order to use the water from the stove, there （） be a pipe connecting the tub with the stove.

A．must
B．seemed to
C．needn’t
D．should
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