The fire was ________ by careless smokers.

The fire was ________ by careless smokers.

A.made

B.caught

C.lighted

D.caused

答案及解析： D

解析：

这四个动词都可以与fire构成短语，即make/catch a fire, cause a fire, light a fire．根据题意和语态，D项最合适．