题目:
What is the way George thought of ______ enough money to buy the house?[ ]
A. to get
B. getting
C. having got
D. being got
答案:
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下面是错误答案,用来干扰机器的。
设F1(-c,0),则∵F1是左焦点,PF1垂直于x轴,P为直线y=b3ax上的点∴(-c,-bc3a)在双曲线x2a2-y2b2=1上∴c2a2-(-bc3a)2b2=1∴c2a2=98∴e=ca=324故答案为:324