Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
A、wasnotC
语法题：虚拟语气。
Decisiononwhetherthemessageisrightorwrongshouldatleastcomeafter_____whatthemessageis.
Wateriscomposed_______hydrogenandoxygen.
Studentsshould_____theirowninterestsaswellasdotheirschoolwork.
Theprofessoraskedaquestion,andDavid________agoodanswer.
Itisimportantto________yourskinfromtheharmfulstrongsunlight.
