The manufacturers had to raise their prices because of the increase in the cost of _______ materials. ( 章节：1 难度：4)
- A、raw
- B、original
- C、rough
- D、primitive
正确答案:A
答案解析:有
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The manufacturers had to raise their prices because of the increase in the cost of _______ materials. ( 章节：1 难度：4)
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