单项选择题
The work（）by the time you get there.
A.will have been done B.was done C.had been done D.has done
单项选择题 The farmer caught the boys（）his apples.
单项选择题 （）all we should put the theory into practice.
单项选择题 When a fire（）at the National Exhibition, at least then priceless paintings were completely destroyed.
