1. 选择恰当的句子，使对话内容完整。

A. What's the matter? B. Can you go to the library with me? C. I am going to the hospital with my mom. D. Good afternoon. E. I had a bad cold.

A: Good afternoon.

B:

A:

B: Sorry, I can't.

A:

B: I felt sick.

A: Oh, you must see the doctor.

B: Yes.