---I don’t think we have met before.
---Yes, once at a party, but we____.
| A．didn’t introduce | B．weren’t introduced | C．haven’t introduced | D．weren’t introducing |
I'd like to be a professional singer, but I don't think I've got
| A．a good voice enough | B．a good enough voice |
| C．a voice enough good | D．an enough good voice |
___________she was invited to the ball made her very happy.
| A．If | B．That | C．When | D．Because |
He__________ he would be able to leave tomorrow, but it's beginning to took difficult.
| A．hopes | B．was hoping | C．had hoped | D．hoped |
—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday?
—I ___________and failed to hear the phone.
| A．might have slept | B．must be sleeping |
| C．might be sleeping | D．must have been sleeping |
Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,________ two boys, aged 11 and 13, shot and killed a teacher and four girls.
| A．while | B．where | C．when | D．then |