单项选择题

I regret to have not paid more attention to our English lessons at school.（）

A．not paying
B．not having paid
C．have not paid
D．not to have paid

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单项选择题
In his speech at the conference, the Chairman solemnly stated that the responsibility to our lives and the kind of world in that we live is ours and ours alone.（）

A．for ... in which
B．of... for which
C．of... in which
D．for ... on which
单项选择题
Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes.（）

A．exclude
B．excluding
C．include
D．are included
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