Mary is in good because she spends an hour around the playground every day.A. healthy run

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