【題目】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】

試題分析：句意：為了火星上生活，你需要穿靴子，這是為了防止你飄進(jìn)太空。此題考查被動語態(tài)，根據(jù)句意，應(yīng)選D。

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