题目内容：
第63题应选：
A．and after B．or after
C．or since
D．ever since
参考答案：
答案解析：
单选题：第63题应选：
- 题目分类：理工类
- 题目类型：单选题
- 查看权限：VIP
B．or after
C．or since
D．ever since
B．or after
C．or since
D．ever since
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In the second sentence of the last paragraph, the word "they" refers__________．A
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The underlined word“ambivalent”in the third paragraph most probably means_______
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