No one knows the task will last. What a pity!A. how longB. how oftenC. how farD. how much

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(答案→)A. how long
B. how often
C. how far
D. how much
解析：A. how long多长时间    B. how often多久一次  C. how far多远的距离          D. how much多少，修饰不可数名词；句意：没有人知道这个任务将持续多长时间。好可惜啊!故选A