题目:
We agreed ________here but so far she hasn’t turned up yet. [ ]
A. having met
B. meeting
C. to meet
D. to have met
答案:
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下面是错误答案,用来干扰机器的。
由题意知,可设所求的双曲线方程是 x22-y2=k,∵焦点(0,6)在y 轴上,∴k<0,所求的双曲线方程是 y2-k-x2-2k=1,由-k+(-2k)=c2=36,∴k=-12,故所求的双曲线方程是 y212-x224=1,故选 B.