The use of the bar code, or Universal Product Code, which was created in part to enable supermarkets to process customers at a faster rate, has expanded beyond supermarkets to other retail outlets and have become readily accepted despite some initial opposition when it was first introduced in 1974.


have become readily accepted despite some initial opposition when it was first introduced in 1974

has become readily accepted despite some initial opposition when they were first introduced in 1974

have become readily accepted despite some initial opposition when first introduced in 1974

has become readily accepted despite some initial opposition when the bar code was first introduced in 1974

bar codes have become readily accepted despite some initial opposition when it was first introduced in 1974

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题目分析：
略

选项分析：

A选项：“扩展到了其它的奥特莱斯”和“已经被很乐意的接受”应该用条形码发出的两个动作，两者应该保持平行，所以have应该改为has。

B选项：when后用了代词they有误。they是一个复数代词，字面上的指代对象必须是句中出现的复数名词，本句中supermarkets、customers、retail outlets均为复数名词，但是它们均在逻辑上是不正确的，应该是the bar code在1974年第一次出现，即，应该用单数代词。

C选项：have应该改为has，错误同(A)。

D选项：Correct. 本选项在逻辑和语法上均是正确的。

E选项：have become readily accepted的对象和first introduced in 1974的对象应该是同一件东西，此时的it应该改为复数代词they。

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