Question

【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

Answer 1

【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。