To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to

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问题 To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world-market demand.

选项 A、improve
B、enhance
C、guarantee
D、gear

答案D

解析 题型:词汇题.gear...to...根据……调整……,improve,enhance两个单词与varieties搭配都不恰当, guarantee也不能与varieties搭配。
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