If the operation ________ carefully prepared, it would not have been successful.
A、wasnotC
语法题：虚拟语气。
Itrainedhardyesterday,______preventedmefromgoingtothepark.
Aftermonthsofvoyage,Columbusarrivedin______laterprovedtobeanewcontinent.
Pleaseremindme_______herthisnote.
Thefurnitureinherbedroomisquitedifferentfrom________inthelivingroom.
Heblamedhispoorperformance_____jetlag.
