In my country, the ________ are all distributed free.

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问题 In my country, the ________ are all distributed free.

选项 A、letters box
B、letters boxes
C、letter’s box
D、letter boxes

答案D

解析 在此处letter box是两个名词叠加,中心词为box,类似用法如history teacher等,letter相当于形容词的作用,不用复数;由于系动词用are,因此 box应用复数。
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