Doctors sometimes________old cures when modern medicine doesn’t work.A、fall onB

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问题 Doctors sometimes________old cures when modern medicine doesn’t work.

选项 A、fall on
B、fall down on
C、fall back on
D、fall in upon

答案 C

解析当现代医学手段不见效时，医生有时会求助于传统疗法。动词短语辨析题。fall on意为“落在……身上”；fall down on意为“(在……方面)失败”；fall back on意为“求助于，退回到”；fall in upon意为“顺便走访”。根据句意，C项为正确答案。

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