Only by studying hard _ imporve her English soon.A she can B she did C can she D did she

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Onlybystudyinghard_imporveherEnglishsoon.AshecanBshedidCcansheDdidsheOnlybystudyinghard_imporveherEn

Only by studying hard _ imporve her English soon.A she can B she did C can she D did she
Only by studying hard _ imporve her English soon.A she can B she did C can she D did she

Only by studying hard _ imporve her English soon.A she can B she did C can she D did she
C
only位于句首引导的倒装句.
这里不存在时态问题,所以不用did.
再说只有通过努力学习,表示能够提高英语,所以用can.

选择C