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The sun is shining brightly, so it is ___ today.
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At the Mars base, clean water ______ (store) in large tanks.
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On Mars, a person must wear a special suit that supplies air and protects the bo…
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For this test, a rover can move only when it has power. The rover is moving. Whi…
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用所给动词的适当形式填空:More space stations ______ (build) on Mar…
被动语态的基本用法
英语
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In the future, humans may live on Mars. Because the gravity on Mars is much weak…
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