( )your best? It's not satisfactory. I'm afraid you'll have to do it again. ( )
A.Will you been trying B.Do you try C.Have you tried D.Are you trying正确答案C
( )your best? It's not satisfactory. I'm afraid you'll have to do it again. ( )
A.Will you been trying B.Do you try C.Have you tried D.Are you trying正确答案C