企源知识库

Companies usually _____ a number of experiments before a new product is launched.
A、practice
B、control
C、carry
D、conduct
【正确答案】：D
【题目解析】：practice练习；control控制；carry携带；conduct组织，实施，进行句意：公司在新产品推出之前通常会进行大量的试验。