题目内容：
（30）应选 A．ensure
B．secure
C．allow
D．permit
参考答案：
答案解析：
单选题：（30）应选
- 题目分类：中级
- 题目类型：单选题
- 查看权限：VIP
（30）应选 A．ensure
B．secure
C．allow
D．permit
（30）应选 A．ensure
B．secure
C．allow
D．permit
（28）应选
（28）应选 A．down B．through C．away D．forward
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