Doctors sometimes ______old cures when modem medicine doesn’t work.A、fall onB、f

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问题 Doctors sometimes ______old cures when modem 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 fall back on 意思是“借助于，依赖，依靠”。fall down(on) 意思是“失败，未能符合要求”。fall on 意思是“袭击，攻击：遭受，遭遇：由……负担”。fall in upon意思是“不期而遇”。

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