I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.
A. while B. when C. then D. as
高三英语单项填空简单题
I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.
A. while B. when C. then D. as
高三英语单项填空简单题查看答案及解析
I had been puzzled over t he problem for over an hour without any result, ________all at once a solution flashed across my mind.
A．while B．when
C．then D．as
高三英语单项填空中等难度题查看答案及解析
Peter had been puzzled over the problem for over an hour___________ all at once the solution flashed across his mind.
A.when B.while C.then D.as
高三英语单项填空中等难度题查看答案及解析
. The committee ______ over the problem among themselves for two hours.
| A．has argued | B．has been arguing | C．have argued | D．have been arguing |
高三英语单项填空简单题查看答案及解析
It was with great joy _______ he worked out the problem that he had long been puzzled about.
A．which B．that C．because D．since
高三英语单项填空中等难度题查看答案及解析
The bus came after I _____ for about half an hour.
| A．had been waiting | B．have been waiting |
| C．have waited | D．was waiting |
高三英语单项填空简单题查看答案及解析
raining hard for 3 hours without stopping.
| A．It is | B．It was | C．It has been | D．It had been |
高三英语单项填空简单题查看答案及解析
I had not been reading for half an hour _____ I heard the steps outside.
| A．when | B．while | C．as | D．since |
高三英语单项填空简单题查看答案及解析
20. _________raining hard for 3 hours without stopping.
21.
| A．It is | B．It was | C．It has been | D．It had been |
高三英语单项填空简单题查看答案及解析
It was reported that the problem had been settled without much________.
A．affect B．affair C．effect D．effort
高三英语单项填空简单题查看答案及解析