Companies usually______a number of experiments before a new product is launched.

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问题 Companies usually______a number of experiments before a new product is launched.

选项 A、practice
B、control
C、carry
D、conduct

答案D

解析 practice:练习,实践;control:控制,管理;carry:运送,携带;conduct:实施,执行。根据句意可知,选D。
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本试题收录于: 英语题库普高专升本分类
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