________did it take them to complete the...

________did it take them to complete the difficult task?

A.How soon B.How old C.How often D.How long

D 【解析】句意：他们花了多长时间完成这项艰巨的任务？考查特殊疑问句。How soon多久（对将来时间提问）；How old多大年龄；How often多久一次；How long多长（对长度/时间提问）。分析句子可知，此处构成“it took sb+时间+ to do sth”结构，翻译为“花费某人多长时间做某事”，表示时长。故选D。

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