--Have you ever seen Peter recently?

--Yes. He__________ me to ask you how you___________ along with your new job these days.

A．has asked;have been getting

B．asked ;were getting

C．often asks;are getting

D．asked;are getting

下列那些方法可以用于药品的纯杂程度检查（）

A.熔点测定法

B.旋光度测定法

C.折光率测定法

D.红外分光光度法

E.PH测定法