By __________ a cheaper material for the steel in our products, we can greatl...

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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8”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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