问题补充:
, the forest fire would have been discovered much earlier.
A. But for their care
B. If they were careful
C. Without their care
D. Had they been more careful
答案:
A. But for their care
B. If they were careful
C. Without their care
(答案→)D. Had they been more careful
解析:考查虚拟语气。本题考查与过去事实相反的虚拟语气,从句Had they been more careful = If they had been more careful。句意:如果不是他们更小心点,森林大火将会更早的被发现。