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#e098483b-8128-492e-aa3b-bbdb25f8583c简单choice_compute充要条件与集合关系集合与常用逻辑用语

充分不必要与集合真包含

已知A={x|x^2-2x-3<<=0}=[-1,3],B={x|2a-1<<=x<<=a+1}。若"x属于B"是"x属于A"的充分不必要条件,则实数a的取值范围是

A. 0<=a<=20<=a<=2
B. 1<=a<=2-1<=a<=2
C. 0<=a<20<=a<2
D. a>=0a>=0