When a machine is______, suitable materials must be chosen for its parts.

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问题 When a machine is______, suitable materials must be chosen for its parts.

选项 A、building
B、build
C、to build
D、to be built

答案D

解析 machine和动词build的关系是被动的,这里的被动语态只有D一项。
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本试题收录于: 英语题库普高专升本分类
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