单项选择题


A．Therefore
B．Indeed
C．However
D．Nevertheless
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单项选择题
A．doneB．preparedC．exploredD．investigated
A．done
B．prepared
C．explored
D．investigated
单项选择题
A．workingB．predictingC．holdingD．managing
A．working
B．predicting
C．holding
D．managing
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