初中英语单选,请指教
21.--Howabout______carexhibition?--Ishouldsayitwas______success.
A.the,aB.the,/C.a,aD.a,/
23.Heisateacherwithalotof______.Heoftentellsusmanyofhisinteresting_____inAfrica.
A.experiences;experiencex05B.experience;experience
C.experience;experiencesx05D.experienced;experience
为什么选A和c,能说明下吗