He would have given you more help, if he ________ so busy.
A、havenotbeenB
本题考察与过去事实相反的虚拟语气。
Itisimportantto________yourskinfromtheharmfulstrongsunlight.
We_____knowledgefromourfamilies,schools,jobs,andthemassmedia.
Theprofessoraskedaquestion,andDavid________agoodanswer.
I'dliketoremindyouthatthereisno_____onthepartofsuspectstoanswerquestions.
Jennycomplainedthatthehospital________hertoomuchforthetreatment.
