Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
C
语法题：虚拟语气。
It is difficult to ________ the implication between the lines.
Hewouldhavegivenyoumorehelp,ifhe________sobusy.
Decisiononwhetherthemessageisrightorwrongshouldatleastcomeafter_____whatthemessageis.
He was ______ to withdraw from running for the presidency.