单选题 The forest fire caused by the volcano is difficult to be ______.
A. put off B. put away C. put out D. put up

【正确答案】 C
【答案解析】本句考查put的短语动词的用法。put out扑灭，熄灭(灯)；put off推迟，延期；put away放好，收好；put up举起，升起。因此只有C符合题意。本句的意思是：“由火山引发的森林火灾很难扑灭。”