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Computer data bases and electronic mail systems have been around since the late
Computer data bases and electronic mail systems have been around since the late
游客
2023-09-27
63
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问题
Computer data bases and electronic mail systems have been around since the late 1970s.
选项
A、计算机数据库和电子邮件自20世纪70年代末,便无处不在了。
B、20世纪70年代后期以来,计算机数据库和电子邮件系统已被广泛使用。
C、20世纪70年代末,计算机数据基础和电子邮递系统就已经在大家周围了。
D、在20世纪70年代后期,计算机数据库和电子邮件已普及了。
答案
B
解析
around=widely used。
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