With three young children to take care of, Cathy is kept on the run every minute of the day.

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问题 With three young children to take care of, Cathy is kept on the run every minute of the day.

选项 A、walking
B、at full speed
C、busy
D、on foot

答案C

解析 on the run意思为“活动,忙碌”。四个选项的意思分别是walk走路;at full speed以高速度;busy繁忙;on foot步行,在进行中。句意是,由于有三个孩子需要照料,凯茜一天每分钟都在不停忙碌中。根据句意可推出正确答案是C选项。
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