题目内容：
第50题应选：
A．Worried B．to worry
C．worrying
参考答案：
答案解析：
单选题：第50题应选：
- 题目分类：公共英语一级
- 题目类型：单选题
- 查看权限：VIP
B．to worry
C．worrying
B．to worry
C．worrying
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