—Alice, why didn’t you come yesterday?
— I________, but I had an unexpected visitor.
| A．had | B．would | C．was going to | D．did |
You ____ him so closely; you should have kept your distance.
| A．shouldn't follow | B．mustn't follow |
| C．couldn't have been following | D．shouldn't have been following |
In fact Peter would rather have left for San Francisco than ____ in New York..
| A．to stay | B．stayed | C．stay | D．having stayed |
Professor Wang , _______ for his informative lectures, was warmly received by his
students.
| A．knowing | B．known | C．to be known | D．having known |
________evidence that language acquiring ability must be stimulated.
| A．If being | B．It is | C．There is | D．There being |
The professor could hardly find sufficient grounds _____his arguments in favor of the new
theory.
| A．to be based on | B．to base on |
| C．which to base on | D．on which to base |