—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
問句用到的疑問詞是how表方式所以答語要用介詞短語By spending作方式狀語。句意：你認(rèn)為他是怎樣在短時間內(nèi)提高英語的？通過每天花費四小時（練習(xí)做到的）。
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