The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others．
| A．were it not for | B．had it not been because |
| C．had it not been for | D．if it had not been |
After leaving office in 1999, Nelson Mandela didn’t stop doing he thought was right.
| A．that | B．which | C．what | D．where |
– I heard you gave a big surprise to your mother on Mother’s Day.
– Yes. Only when I left my parents ______ how much I loved them.
| A．I realize | B．I had realized | C．had I realize | D．did I realize |
Owing to her balanced diet and regular exercise, she is very slim and athletic _____.
| A．in height | B．in detail | C．in shape | D．in sight |
Most of the audience wondered what idea a man who’s deaf from birth can have__ music.
| A．with | B．in | C．of | D．at |
I don’t drink now, but I ______ for almost ten years.
| A．ever drank | B．was ever drinking |
| C．have ever drunk | D．had ever drunk |