题目内容
Such a good opportunity, once ______, might never come again.
| A．lost | B．to lose | C．losing | D．loses |
A
解析试题分析：考查状语从句的省略：句意：这样的好机会，一旦错过了，可能再也不能回来了。这句话的状语从句完整的是：Once a good opportunity is lost，当主从句的主语一致的时候，可以省略从句的主语和be动词，所以选A。
考点：考查状语从句的省略
智能训练练测考系列答案
计算高手系列答案So far as I am concerned, he is a determined man and on no account ______ die easily.
| A．he says | B．he does say | C．says he | D．does he say |
It was after he got what he had desired_____ he realized it was not so important.
| A．that | B．when | C．as | D．since |
I’m sure you’d rather she went to school by bus,_______?
| A．hadn’t you | B．wouldn’t you | C．aren’t I | D．didn’t she |
It was not until Susan came back ______her close friends were waiting for him.
| A．which she knew | B．which did she know |
| C．that she knew | D．that did she know |
--- You can’t have enjoyed your picnic in the rain last Saturday, I’m afraid.
--- On the contrary, we ______.
| A．can | B．must | C．did | D．have |
The problem will appear____ a different welfare system will be created.
| A．unless | B．whether | C．until | D．if |
Cindy shut the door heavily and burst into tears. No one in the office knew _____ she was so angry.
| A．where | B．whether | C．that | D．why |
When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
| A．that | B．which | C．where | D．when |