Every device______in the spacecraft must be designed and made with great care so as to be sure that nothing goes wrong in operat

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问题 Every device______in the spacecraft must be designed and made with great care so as to be sure that nothing goes wrong in operation.

选项 A、to be fitted
B、fitted
C、fitting
D、to have been fitted

答案A

解析此处用不定式是指“(将)要装配在宇宙飞船上的每个器械必须精心设计制作……”，我们知道不定式与动名词的区别之一是不定式表示即将实现的动作，而动名词可以表示已实现的动作。另外不定式在句中作device的定语，与它的关系是受动，所以C是错误的。fitted是过去分词，作后置定语时表示一种状态，与句意不符。如果选D，那么句子前后矛盾，因为后半句说明对器械的设计和制作还没有进行，装配怎么可能已经完成了呢?所以D是错误的。

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