The ancient Egyptians are supposed _________ rockets to the moon.

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问题 The ancient Egyptians are supposed _________ rockets to the moon.

选项 A、to be sending
B、to send
C、to have sent
D、to have been sending

答案C

解析固定结构“sb／sth is supposed to do sth”。在这个句子中，因为send的动作发生在过去，而且发生在谓语动词suppose之前，所以send用不定式的完成式“to have sent”。

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