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单选题
The pair of shoes ___ worn out.
A
had been
B
have been
C
were
D
was
答案解析
正确答案：D
解析：
这是一道关于主谓一致和时态的单选题。首先，我们分析题干的关键信息：
* 主语是“The pair of shoes”，表示“一双鞋”。
* 谓语部分描述鞋的状态，且题干没有提供明确的时间背景，因此默认为一般过去时。
接下来，我们逐个分析选项：
A: had been - 这是过去完成时，表示过去的过去，但题干没有提供足够的信息来支持这种时态。
B: have been - 这是现在完成时，与题干的一般过去时背景不符。
C: were - 虽然“were”是复数形式的be动词，但“The pair of shoes”作为一个整体，应视为单数。
D: was - “was”是单数形式的be动词，与“The pair of shoes”作为单数整体相匹配，且适用于一般过去时。
根据主谓一致原则，“The pair of shoes”应视为单数，因此谓语应使用单数形式的动词。同时，题干描述的是鞋的状态，且没有特定的时间背景，因此使用一般过去时“was”是正确的。
综上所述，正确答案是D：“was”。
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