问题补充:
A. is improving; taking
B. has been improved; being taken
C. improved; taken
D. is improving; have taken
答案:
(答案→)A. is improving; taking
B. has been improved; being taken
C. improved; taken
D. is improving; have taken
解析:他觉得每隔一天的长距离散步使自己的健康状况每天都在改善。owing to的to是介词,后面要加名词或动名词,而他散步,是主动的动作,故选A。