— What made Bill so angry?
— ______. His girl friend promised to come at 8:30, but she hasn’t come yet.
| A.Having kept waiting | B.Being kept waiting |
| C.To be keeping wait | D.Being kept waited |
--- We expected you yesterday.
--- I'm sorry, Iyou to say that I couldn't be here until today.
| A.must have called | B.would be calling |
| C.could have been calling | D.should have called |
He is ____our teacher; he is also our best friend.
| A.less than | B.rather than | C.more than | D.better than |
--Why does the river smell terrible?
--Because large quantities of water__________.
| A.have polluted | B.is being polluted | C.has been polluted | D.have been polluted |
_______that they lost the game, tears came down Kate’s face.
| A.On hearing the news | B.When heard the news |
| C.The moment she heard the news | D.While hearing the news |
Children’s brains can’t develop properly_______ they lack protein(蛋白质).
| A.when | B.since | C.because | D.unless |