The gray building is where the workers live, and the white one is where the spare parts ______. ( 章节：1 难度：3)
- A、are producing
- B、are produced
- C、produced
- D、being produced
正确答案:B
答案解析:有
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The gray building is where the workers live, and the white one is where the spare parts ______. ( 章节：1 难度：3)
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