以牛奶送服左旋多巴（）

A．作用相悖，茶碱可加快心率

B．酸化尿，易在 * * 中形成结晶

C．肠内产生大量氨基酸，阻碍吸收

D．抑制乙醛脱氢酶，出现双硫仑样反应

E．酸化尿、排泄慢、减弱活性、加重毒性

________ your letter, I would have set off two days ago.

A．If I could have received

B．Should I receive

C．If I received

D．Had I received