請問黃金閱讀types of social groups (TPO13) - 英檢

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請問第四題
Which of the following can be inferred about instrumental ties from the author's mention of working with competitors in paragraph 2?
我知道2 3 4選項都錯 可以用刪去法選出答案 但是還是想知道第一個為什麼對
請問一下有什麼線索嗎? 謝謝~X

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