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 句意:在一项新产品发布前公司通常会进行一些试验。practice练习,实践;control控制;carry运送,携带;conduct实施,执行。
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