Because the United States has little tin, ______ produced in the rest of the wor

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问题 Because the United States has little tin, ______ produced in the rest of the world.

选项 A、tin is used
B、it uses tin
C、uses of tin
D、uses tin

答案 B

解析结构识别逗号前的是原因状语从句，后面是主句；原因状语从句的主语应与主句主语一致，因此答案为B。

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