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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