-- Can I call you back at two o'clock this afternoon?
-- I'm sorry, but by then I ____ to Beijing. How about five?
| A．fly | B．will fly |
| C．will be flying | D．am flying |
The book was written in 1946, __________ the education system has witnessed great charges.
| A．when | B．during which |
| C．since then | D．since when |
—Where did you get to know her?
—It was on the farm __________ we worked.
| A．that | B．there |
| C．which | D．where |
Some pre-school children go to a day-care center, __________ they learn simple games and songs.
| A．then | B．there |
| C．while | D．where |
After graduation she reached a point in her career __________ she had to decide what to do.
| A．that | B．what |
| C．which | D．where |
He was educated at the local high school, __________ he went on to Beijing University.
| A．after which | B．after that |
| C．in which | D．in that |