单项选择题

A．studying
B．studied
C．to study
D．having studied
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单项选择题
A．thereforeB．ifC．despiteD．although
A．therefore
B．if
C．despite
D．although
单项选择题
A．manufactureB．initiateC．prepareD．record
A．manufacture
B．initiate
C．prepare
D．record
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