The students ___ busily when Miss Brown went to get a book she ___ in the office.
| A．had written ; left | B．were writing ;has left |
| C．had written ;had left | D．were writing ;had left |
It is generally accepted that _____ boy must learn to stand up and fight like _____ man.
| A．a; a | B．a; the | C．the; the | D．a; 不填 |
I think nobody makes _______ contributions to the company than him.
| A．greater | B．more great | C．more greater | D．much great |
I have been living in the United States for twenty years, but seldom_______ so lonely as now.
| A．have I felt | B．I had felt | C．I have felt | D．had I felt |
Today’s teens don’t see anything strange in the fact _______the computer takes up a central place in their social lives.
| A．which | B．that | C．where | D．what |
I _______to go shopping that Saturday, but the bad weather made me change my mind.
| A．plan | B．would plan | C．had planned | D．have planned |