◎ 题干
—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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—How do you think he managed to improve his English in such a short time? —______ four hours on it every day.A.Because of spendingB.To spendC.By spendingD.Spend…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。