People there are told it is their ________ duty to support the national economy by buying their own products. A、tragic B、patriotic C、diligent D、optimistic

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题目内容（兰州工业学院大学英语3）

People there are told it is their ________ duty to support the national economy by buying their own products.
A、tragic
B、patriotic
C、diligent
D、optimistic

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河南工学院数控技术及应用