单项选择题

Cooperation should __ for mutual benefit in energy development and utilization.

A．be enhanced
B．enhance
C．have enhanced
D．to be enhanced
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单项选择题
Devotion means __ our heart on one thing at a time and give up all other thoughts.
A． setting
B．set
C．to set
D．that setting
单项选择题
The playing cards we use today are much like those __ for hundreds of years.
A．were used
B．. used
C．been used
D．using
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