I know Mr Brown; we ______ to each other at an international conference. 
#104666
A
are introduced
B
have been introduced
C
were introduced
D
had been introduced
推荐题目
—Do you regret having left your first job?—Why should I?I   as much,but I enjoy more of it.
#103953
A
didn’t earn
B
don’t earn
C
hadn’t earned
D
haven’t earned
I could have arrived much earlier, but I ____ in the traffic.
#101718
A
would be caught
B
was caught
C
has been caught
D
had been caught