题目内容：
第48题答案为（ ）。
A．until B．before
C．when
D．as
参考答案：
答案解析：
单选题：第48题答案为（ ）。
- 题目分类：公共英语二级
- 题目类型：单选题
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B．before
C．when
D．as
B．before
C．when
D．as
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