单项选择题

A．concerned with
B．concerning
C．concerning with
D．concerned for
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单项选择题
A．NeverthelessB．MoreoverC．HoweverD．Therefore
A．Nevertheless
B．Moreover
C．However
D．Therefore
单项选择题
A．had shiftedB．have shiftedC．shiftingD．shifted
A．had shifted
B．have shifted
C．shifting
D．shifted
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