题目内容
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
| A．only if | B．until |
| C．so that | D．even though |
C
解析试题分析：only if只要……就；until直到；so that以便，所以；even though虽然，即使。句意：弗兰克带了一个口罩，以便他在雾霾天气也能保持健康。故选C。
考点：考查连词辨析
you practice your English every day, you won’t make any progress on it.
| A．Although | B．If |
| C．Unless | D．Since |
Daisy has been learning Putonghua __________ the age of five.
| A．at | B．since | C．for | D．in |
Your dream will come true _______ you put your heart and soul into it.
| A．if | B．unless |
| C．although | D．until |
—It’s a long story, but you will find that there are few new words in it .
—Good! it will be too hard for children.
| A．So | B．And | C．But | D．Or |
I got up late yesterday, ____ I had to take my breakfast with me on the bus.
| A．and | B．but | C．or | D．so |
It’s foggy today. I’m not sure the highway will close soon. Let’s set off earlier.
| A．whether | B．when | C．how | D．why |
Have sports training every day, ______you won’t be healthy in the future.
| A．because | B．or | C．unless | D．since |