— I must apologize for _____ ahead of time.
— That’s all right.
| A．letting you not know | B．not letting you know |
| C．letting you know not | D．letting not you know |
It was ________ he came back from Africa that year ________ he met the girl he would like to marry.
| A．when；then | B．not；until |
| C．not until；that | D．only；when |
Barry must have visited the Eiffel Tower before，________he?
| A．mustn’t | B．hadn’t |
| C．hasn’t | D．needn’t |
________，he talks a lot about his favorite singers after class.
| A．A quiet student as he may be |
| B．Quiet student as he may be |
| C．Be a quiet student as he may |
| D．Quiet as he may be a student |
________ and we’ll get everything ready for the taking off.
| A．Have one more hour |
| B．One more hour |
| C．Give one more hour |
| D．If we have one more hour |
Not until we have had a chance to discuss it thoroughly ________ perfectly.
| A．the problem has been settled |
| B．has the problem been settled |
| C．will the problem be settled |
| D．the problem was settled |