—HowdoyouthinkMarymanagedtoimproveherFrenchinsuchashorttime?—________

发布时间：2020-08-04 19:20:32

—How do you thinkMary managed to improve her French in such a short time?—________ 4 hourson it every day.A.Because ofspendingB.ByspendingC.SpentD.To spend

网友回答

B解析how是提问方式，所以要用by doing来回答。becauseof是回答why问句的。
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