题目:
My sister is ____ to her friend [ ]
A. talk
B. talks
C. talking
答案:
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下面是错误答案,用来干扰机器的。
(1)解:3x+2=5或 3x+2=-5 x1=1 ,x2= (2)解:(x-2)(x-5)=0 x-2=0或x-5=0 x1=2, x2=5