－Could you tell me _____?

－Sorry. I don't know. I was not at the meeting. [ ]

A. what does he say at the meeting

B. what did he say at the meeting

C. what he says at the meeting

D. what he said at the meeting

气相色谱法测定水中阿特拉津时，阿特拉津标准贮备液用（）定容。

A.三氯甲烷

B.二氯甲烷

C.丙酮

D.甲醇