【答案解析】time作“时间”讲时，一般为不可数名词，由此可将B排除，例如：Her time isfully occupied with her three children．她的三个孩子占用了她全部时间。由于it took us是定语从句，其先行词为“特指的时间”，因此time前要加定冠词，由此可将A和D排除，正确答案为C。分数前一般不需要加定冠词，例如：Two-fifths of his property was lost．他失去了2／5的财产。More than two—thirds of the workers in this textile mill are girls．这家纺织厂2／3以上的工人是女性。