——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 |
I showed several old friends of mine around the city, _________ surprise，the changes had been so great.
| A．whose | B．to whose | C．which | D．to which |
_______ his own experiences in Italy, Mr. White created this famous novel.
| A．Drawing on | B．Insisting on | C．Living on | D．Working on |
It’s impossible for him to escape ________ this time; he made such a big mistake.
| A．to punish | B．punishing | C．being punished | D．having punished |
—Who do you think will get the first prize?
—Mary, of course. She ________ for the competition for months.
| A．is preparing | B．was preparing |
| C．had been preparing | D．has been preparing |
She didn’t come to the party last Sunday. _________, she must have made the party more exciting.
| A．If she came | B．Would she come |
| C．Had she come | D．Did she come |