By the time of 1969, there were many space explorations.

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问题 By the time of 1969, there were many space explorations.

选项 A、have been
B、must be
C、had been
D、must have been

答案C

解析截至1969年。已有大量太空探索活动。本题考查时态的用法。1969为一个过去的时间点，By the time of 1969“截至1969”则表示过去的过去，因此要用过去完成时，选C项。

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本试题收录于： CATTI二级笔译综合能力题库翻译专业资格（CATTI）分类

CATTI二级笔译综合能力

翻译专业资格（CATTI）

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By the time of 1969, there were many space explorations.

CATTI二级笔译综合能力

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Thesearchforoneoflife’sgreatestgoals,happiness,iswhatbringsalmost1,200studentstooneofYaleUniversity’smostpo

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