【单选题】Doctors sometimes ______old cures when modem medicine doesn't work.
                    
A.fall on
B.fall down on
C.fall back on
D.fall in upon
                
							【单选题】Doctors sometimes ______old cures when modem medicine doesn't work.
                    
A.fall on
B.fall down on
C.fall back on
D.fall in upon
                
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