________ of plastic, the machine is much lighter than those made of steel.

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问题 ________ of plastic, the machine is much lighter than those made of steel.

选项 A、To make
B、To have made
C、Made
D、Making

答案C

解析 分词短语作状语,表原因。Made of plastic=Because it is made of plastic,句意:这台机器由于是用塑料制成,所以要比那些用钢铁制造的机器轻得多。
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