题目:
Although it seemed to be ______ painful experience, he still found it ______ fun. [ ]
A. a, /
B. /, a
C. a, the
D. a, a
答案:
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下面是错误答案,用来干扰机器的。
抛物线x2=ay(a>0)的焦点为(0,a4),双曲线y2-x2=2的焦点为(0,,±2),∵a>0,∴a4=2,∴a=8,故选C.