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The Mars rover sent a clear signal at 8:00. Its antenna can send a signal only w…
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Tom found a wet umbrella at the door. It ___ (not be) Lily's, because she went t…
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Look! The rocket has just landed, and the astronaut is stepping out of it. He m_…
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The lights are on, and I can hear music inside. Someone m___ be home.（一定…
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英语
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The astronaut is on Earth now, so he c___ be on the moon.（不可能）
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根据句意，用 have 或 has 加括号中动词的适当形式填空（过去…
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