____ the chat room ten minutes ago, you
题型:选择题
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
____ 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