______ of plastics, the machine works perfectly.

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问题 ______ of plastics, the machine works perfectly.

选项 A、Being made
B、Having made
C、Made
D、To be made

答案C

解析 本句意为:这台机器是由塑料做成的,它运转得很好。前句是做状语的,由于machine与前句存在被动关系,所以用made最佳。
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