问题
选择题
—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
答案
答案：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）。