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【题目】To live on Mars, you need to wear boots which ________ to prevent you from floating off into space.

A. design B. designed

C. are designing D. are designed

【答案】D

【解析】

试题分析:句意:为了火星上生活,你需要穿靴子,这是为了防止你飘进太空。此题考查被动语态,根据句意,应选D。

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