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—How do you think he managed to improve his English in such a short time?
—______ four hours on it every day.
A.Because of spendingB.To spend
C.By spendingD.Spending
C
问句用到的疑问词是how表方式所以答语要用介词短语By spending作方式状语。句意:你认为他是怎样在短时间内提高英语的?通过每天花费四小时(练习做到的)。
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