已知x，y满足则2x-y的最大值为（ ）
—_______is this beautiful woman? —She is my mother. A.What B.Where C.Who
We should study_______and stay_______. A.hard;healthy B.hardly;healthy C.hard;healthly
He_______a very_______life. A.has,health B.has,healthy C.does,healthy
Where does he_______? A.works B.work C.working
Sometimes Anna_______in Beijing. A.live B.living C.lives
则2x-y的最大值为（ ）
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