题目内容：

no one knows how long it will last.they don't know how long it will___
A.keep B.hold C.carry D.continue ,请问选择哪一个,为什么

优质解答

答案：C
因为：keep,hold,carry都是及物动词,continue有不及物动词的用法,而句子没有宾语,故选continue.