题目内容

_____ the morning train, he would not have been late for the meeting.

A. Did he catch
B. Should he catch
C. Has he caught
D. Had he caught

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People are recycling many things which they _____ away in the past.

A. had thrown
B. will be throwing
C. were throwing
D. would have thrown

( )表示主机的资源记录,( )表示别名的资源记录。

www.163.com是Internet中主机的()。

A. 用户名
B. 密码
C. 别名
D. IP地址

在 DNS服务器配置文件中A类资源记录是什么意思? ()

A. 官方信息
B. IP地址到名字的映射
C. 名字到IP地址的映射
D. 一个name server的规范

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