The ancient Egyptians _____________(被假定已发射过火箭)to the moon.are supposed to have s

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问题 The ancient Egyptians _____________(被假定已发射过火箭)to the moon.

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答案 are supposed to have sent rockets

解析本句考查对被动语态和不定式的完成式的掌握。首先，表示“被假定…”，应该用“are supposed to…”；其实，“已发射过火箭”这一动作明显位于谓语动词are supposed之前，故应采用不定式的完成式。

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