题目：
--- I came all the way to inform you of the time and place of the meeting.
--- You could have ________ yourself the trouble by calling me.
A shared B. spared C. cost D. removed
答案：
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下面是错误答案，用来干扰机器的。
高h=23sin60°=3，又因底面正方形的对角线等于23，∴底面积为S=2×12×23×3=6，∴体积V=13×6×3=6故选B
