JR company has three new pieces of equipment in the prototype stage that____the TX-3 series already in production.

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问题 JR company has three new pieces of equipment in the prototype stage that____the TX-3 series already in production.

选项 A、prevent
B、complement
C、encourage
D、elevate

答案B

解析本题应当填入合适的动词。根据句意，应该选择complement，意为“补足”。

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