题目内容：
第（49）题选 A．when
B．while
C．as
D．but
参考答案：
答案解析：
单选题：第（49）题选
- 题目分类：成人英语三级
- 题目类型：单选题
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第（49）题选 A．when
B．while
C．as
D．but
第（49）题选 A．when
B．while
C．as
D．but
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