Miss Li ______ as a secretary for five years in the company，and now she is general manager of it.
| A．serves | B．served |
| C．had served | D．has served |
考点：时态和语态
—Listen! There is a knock on the door．Who _____ it be?
—It must be Jack．Just now I sent for him．
| A．shall | B．can | C．must | D．might |
—What made the applicant so anxious?
—_____ he will get a job interview tomorrow．
| A．That | B．Because | C．Since | D．When |
Just like fingerprints, each person’s DNA is ________unless he has a twin．
| A．unusual | B．normal | C．various | D．unique |
— What do you think of investing in today’s stock market?
— There are many risks, but also many gains．
| A．potential | B．confidential | C．influential | D．preferential |
The new CRH train between Beijing and Shanghai _______ speed once reached about 350km/h has had a 50 kph speed cut to 300 kph.
| A．whose | B．where | C．that | D．which |