Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
C
语法题：虚拟语气。
CharlesSmith,______wasmyformerteacher,retiredlastyear.
Heblamedhispoorperformance_____jetlag.
Jennycomplainedthatthehospital________hertoomuchforthetreatment.
Itisdifficultto________theimplicationbetweenthelines.
Notuntilrecently_____thatThompsonhadbentellingthetruthallalong.