My sister met him at the Grand Theatre yesterday afternoon, so he ________ your lecture.
| A．couldn’t have attended | B．needn’t have attended |
C．mustn’t have attended | D．shouldn’t have attended |
I don’t believe we’ve met before，________I must say you do look familiar.
| A．therefore |
| B．although |
| C．since |
| D．unless |
He smiled politely ________ Mary apologized for her drunken friends.
| A．as |
| B．if |
| C．unless |
| D．though |
—Coach，can I continue with the training?
—Sorry，you can’t________you haven’t recovered from the knee injury.
| A．until |
| B．before |
| C．as |
| D．unless |
I had hardly got to the office________my wife phoned me to go back home at once.
| A．when |
| B．than |
| C．until |
| D．after |
Please call my secretary to arrange a meeting this afternoon，or________it is convenient to you.
| A．whenever |
| B．however |
| C．whichever |
| D．wherever |