---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.Spending
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C解析受汉语思维的影响，本题很容易误选A项。答语应该是针对问句中的特殊疑问词how，故选C项。完整句子为：He managed to improve his English in such a short time by spending four hours on it every day．若选A项，问句应改为：Why do you think he managed to improve…?