【单选题】

In the last century, old people did not have so many problems because ______.
A．they had big families

B．they lived with their children
C．the young were kind to the old
D．the society didn't change so rapidly

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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

9%的考友选择了B选项

2%的考友选择了C选项

87%的考友选择了D选项

In the last century, old people did not have so many problems because ______.A．they had big families