单项选择题
A. but B. only C. even D. besides
（）what would happen, none of them could find a way out....
单项选择题（）what would happen, none of them could find a way out.
A. Left wondering B. Having left wondering C. Leaving to wonder D. Having left to wonder
-- The experiment is of particular importance. --I see...
单项选择题-- The experiment is of particular importance. --I see. We won't carry on with it （） we can get the good equipment.
A. until B. unless C. whether D. after
The Intemet and the effect （） brought about did a lot o...
单项选择题The Intemet and the effect （） brought about did a lot of good to our daily life and work.
A. that B. what C. which D. it
