能使2，6-二氯靛酚试液的颜色立即消失的药物是

A．抗坏血酸

B．水杨酸

C．枸橼酸

D．蔗糖

E．对氨基苯甲酸

I look forward to（）for this at your earliest convenience.

A.having your approval

B.approved by you

C.get your answer

D.know your opinion