If the operation ________ carefully prepared, it would not have been successful.
A、wasnotC
语法题：虚拟语气。
Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
Thetwogirlscompetedwitheachother______thehighestmark.
CharlesSmith,______wasmyformerteacher,retiredlastyear.
Theypreferto_______therestofthemorningwalkinginthegarden.
Pleaseremindme_______herthisnote.
