单项选择题

My friend, who ______ on the International Olympic Committee all his life, is retiring next month.
A.served B.is serving C.had served D.has served

A.
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--- It took me ten years to build up my business, and it almost killed mE. --- Well, you know what they say. _________. A.There is no smoke without fire B.Practice makes perfect C.All roads lead to Rome D.No pains, no gains
A.  
B.
单项选择题
-Mom,what did your doctor say? -He advised me to live _____ the air is fresher. A.in where B.in which C.the place where D.where
A.B.in
C.in
D.the
E.where
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