_____ scores of times, but he still couldn’t understand it.
| A．Having explained | B．Having been explained |
| C．Though it was explained | D．It was explained |
Based on some lawyers’ ideas, the more severe the punishment, ___________.
| A．the less likely crime | B．the less likely the crime |
| C．the crime less likely | D．the less the likely crime |
The hostess of the party, who ______ as a doctor for five years, is president of a famous private school.
| A．worked | B．has worked | C．works | D．had worked |
Of the two brothers, Bill is ____ younger one, and he is a quiet boy, _____ that most adults like very much.
| A．a; one | B．a ; the one | C．the; one | D．the ; the one |
The officials soon realized that, _________, things would get worse.
| A．unless dealt with it properly | B．if not properly dealing with |
| C．unless properly dealt with | D．if dealt not properly with |
Great changes have taken place in that school. It is no longer ______ it was 20 years ago, _____ it was so poorly equipped.
| A．what; when | B．that; which | C．what; which | D．which; that |