问题补充:
Mary is in good because she spends an hour around the playground every day.
A. healthy, run
B. healthy, running
C. health,in running
D. health, on running
答案:
A. healthy, run
B. healthy, running
(答案→)C. health,in running
D. health, on running
解析:句意:玛丽身体健康因为他每天花费一个小时的时间围绕操场跑步。Be in good health 固定词组身体健康,spend+时间+doing固定句型表示花费多长时间做某事,根据语境故选C