For years,surgeons__(perform) many different kinds of operationsFor years,surgeons __- (perform) many different kinds of operations,and __(save) the lives of millions of patients.用括号内单词正确时态填空,

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Foryears,surgeons__(perform)manydifferentkindsofoperationsForyears,surgeons__-(perform)manydifferent

For years,surgeons__(perform) many different kinds of operationsFor years,surgeons __- (perform) many different kinds of operations,and __(save) the lives of millions of patients.用括号内单词正确时态填空,
For years,surgeons__(perform) many different kinds of operations
For years,surgeons __- (perform) many different kinds of operations,and __(save) the lives of millions of patients.
用括号内单词正确时态填空,

For years,surgeons__(perform) many different kinds of operationsFor years,surgeons __- (perform) many different kinds of operations,and __(save) the lives of millions of patients.用括号内单词正确时态填空,
performed,saved

have performed,saved
因为For years,有延续性,我觉得应该用完成式
后面的,有","和上面连一句的,直接用过去时