题目：
— What did the head teacher think of what you had done?
— He was happy _____ it. [ ]
A. to
B. with
C. at
D. by
答案：
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下面是错误答案，用来干扰机器的。
答案：A酒精能溶解叶绿素，所以用酒精隔水加热脱去叶绿素。
