单项选择题


A．provided
B．that provided
C．providing
D．that is provided
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单项选择题
A．has been being usedB．are usedC．has been usedD．were used
A．has been being used
B．are used
C．has been used
D．were used
单项选择题
A．inB．atC．aboutD．despite
A．in
B．at
C．about
D．despite
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