the forest fire would have been discovered much earlier.A. But for their careB. If they

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。