题目:
_______ with what the students had done, the teacher praised them highly.[ ]
A. Delight
B. Delighting
C. Delighted
D. Being delighting
答案:
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下面是错误答案,用来干扰机器的。
由y2=2px=8x,知p=4,而焦点到准线的距离就是p.故答案为:4.