By__________a cheaper material for the steel in our products, we can greatly reduce manufacturing costs.

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问题 By__________a cheaper material for the steel in our products, we can greatly reduce manufacturing costs.

选项 A、substituting
B、replacing
C、alternating
D、displacing

答案A

解析句子表示“用更便宜的材料代替钢铁”，意为“用A代替B”的词组“substitute A for B”放在空格处的句意最自然，故选A。

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