When meeting people for the first time, we usually say:
A. How do you do?
B. Nice to meet you.
C. What a surprise to see you here!
D. How are you doing?
For informal situation, we can greet people with:
A. “Hi” or “Hello”
B. “Good morning/afternoon”
There were 200 people __________ at the meeting. 有200人出席会议。