问题补充：
The headmaster spoke at the meeting for about 2 hours without his notes．
A. according to
B. looking for
C. referring to
D. looking up
答案：
A. according to
B. looking for
(答案→)C. referring to
D. looking up
解析：“校长在大会上讲了大约两个小时也没看他的稿子。”A according to 根据 B．looking for寻找 C．referring to 参考 D．looking up查找。因此答案C。
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