13. (单选题) In manufacturing, cheaper materials are constantly being _______ for the better and more expensive kind. ( )(本题2.0分) A、 replaced B、 displaced C、 substituted D、 converted

13. (单选题) In manufacturing, cheaper materials are constantly being _______ for the better and more expensive kind. ( )(本题2.0分)
A、 replaced
B、 displaced
C、 substituted
D、 converted

出自：西安石油大学英语二

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