The old man has retired from the factory. He _____ there for 30 years.
| A．works | B．worked | C．has worked | D．was working |
is reported, Shenzhou VI has returned successfully.
| A．It | B．This | C．That | D．As |
The advanced worker, _________to devote himself to the factory, has succeeded in developing new techniques of production.
| A．determined | B．determining |
| C．having determined | D．to determine |
I can hardly imagine peter ____ across the Atlantic Ocean (大西洋)in five days.
| A．sail | B．to sail |
| C．sailing | D．to have sailed |
Many students insist that the choice of their courses and universities ______ their own interest.
| A．be based on | B．base on |
| C．be basing on | D．base at |
I simply couldn’t understand how it _____ that you did so much work within such a short time．
| A．came about | B．came back |
| C．came up | D．came along |