2. 外语
  3. To survive in the intense trade competition between countries, we must ______ the qualifies and varieties of products we make to

To survive in the intense trade competition between countries, we must ______ the qualifies 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 qualifies 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 尽管她尚未痊愈，但她还是出院了。discharge允许……离开，释放；extract摘录，选录；inject注射；drain排水。
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