You shoud understand the traffic rule by now .You`ve had it( )often enough.A.explaining B.explained

You shoud understand the traffic rule by now .You`ve had it( )often enough.A.explaining B.explained what shoud you do?具体 If you want______,you shoud speak slowly and clearly to the listener.A.to be understood B.to understand it C.understanding D.to understood 应选什么?为什么? are you understand 还是do you understand Can you tell me how shoud I to do it can you tell me what shoud i do 如何将Can you tell me what I shoud do? you shoud be back not later than six o'clock You shoud't frighten the cat(改为同义句) I thank you shoud drink some hot tea____怎么填空 hope you understand what i hope you understand Do you understand me? I understand you better Do you understand Can you understand me Are you understand You lie,I understand.