Do you think he would have given you a hand in your time of financial difficulty?
He ______ had he known about it. After all, we are good friends.
| A．wouldn’t have | B．should have |
| C．couldn’t have | D．must have |
A few days after the interview，I recevied a letter ________ me admission to the university.
| A．offering | B．offered |
| C．having offered | D．to be offered |
—We didn't find the Blacks ________ the lecture.
—No one had told him about ________ a lecture the following day.
| A．to attend；there to be | B．attending；there being |
| C．attended；there be | D．attend；there was |
Only ________ according to the directions can the medicine be quite effective.
| A．taking | B．taken |
| C．being taken | D．having been taken |
The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction.
| A．seeing | B．having seen |
| C．to see | D．to have seen |
—Hi，Mary.Would you like to go to the concert this evening?
—Sorry，Tom.________ tomorrow's lessons，I have no time to go out with you.
| A．Not preparing | B．Not having prepared |
| C．Not to prepare | D．Being not prepared |