He looks very tired . He ____ to bed too late last night .
| A．must go | B．must have gone | C．could go | D．didn''t go |
I recommended strongly that you ______a more powerful computer, even though your brother recommended ______ an ordinary one.
| A．bought; to buy | B．buy; buying | C．would buy; to buy | D．bought; buying |
Mr Li began to teach in this school, _______, some time later, she became popular with the teachers and students for her excellent teaching levels.
| A．where | B．when | C．that | D．which |
As the saying goes, practice makes perfect, ______is only by using English as often as possible can you learn English well.
| A．which | B．as | C．that | D．this |
I had no idea how it______ that he should have been late for class three times a week.
| A．came across | B．came about | C．came out | D．came down |
The reporters exposed the corruption (腐败) of several high officials in the government;
as a result, they ________ to resign from office.
| A．asked | B．were asked | C．had been asked | D．have asked |