-How do you think he managed to improve
问题:
-How do you think he managed to improve his English in such a short time?
-______ four hours on it every day.[ ]
A.Because of spending
B.To spend
C.By spending
D.Spending
-How do you think he managed to improve his English in such a short time?
-______ four hours on it every day.[ ]
A.Because of spending
B.To spend
C.By spending
D.Spending