摘要：15．Last week I took part in the Civil Service Admission Examination, for which I for nearly three months． A．had prepared B．would prepare C．was preparing D．have been preparing
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Last week I took part in the Civil Service Admission Examination, for which I ________ for nearly three months．
[ ]
A．
had prepared
B．
would prepare
C．
was preparing
D．
have been preparing