问题

____ the chat room ten minutes ago, you would have known what we were talking about! [ ]

A: Had you joined
B: If you joined
C: If you had taken part in
D: Had you participated

正确答案是：

同类题型

Have you graduated from Shandong University—Yes.I________there for 4 years.

Sorry I can’t go with you-something has just _____.

This is my friend. ______ name is Bob.

The glass doors have taken the place of the wooden ones at the entrance,_________in the natural light during the day. [ ]

下列词语中，加横线字的注音全都正确的一项是（）