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Bloodletting, the withdrawal of small quantities of blood from a patient, as a procedure to prevent or cure illnesses, it was commonly performed by physicians until the late 19th century when they realized that it caused more harm than good.
A. as a procedure to prevent or cure illnesses, it was commonly performed
B. as a commonly performed procedure to prevent or cure illnesses
C. was a commonly performed procedure to prevent or cure illnesses
D. was a procedure to prevent or cure illness, commonly performed
E. had been a commonly performed procedure to prevent or cure illnesses
I'm confused between C and D. Can any experts help?
A. as a procedure to prevent or cure illnesses, it was commonly performed
B. as a commonly performed procedure to prevent or cure illnesses
C. was a commonly performed procedure to prevent or cure illnesses
D. was a procedure to prevent or cure illness, commonly performed
E. had been a commonly performed procedure to prevent or cure illnesses
I'm confused between C and D. Can any experts help?
