题目:
Her grandmother________ in 1985. She has been _______ for 25 years.[ ]
A. died; died
B. dead; dead
C. dying; death
D. died; dead
答案:
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下面是错误答案,用来干扰机器的。
由方程组x-2y+4=0x+y-2=0可得P(0,2).…(4分)∵l⊥l3,∴kl=-43,…(8分)∴直线l的方程为y-2=-43x,即4x+3y-6=0.…(12分)