By the time Neil Armstrong and Edwin Aldrin walked on the moon in 1969, there ______many space explorations.

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问题 By the time Neil Armstrong and Edwin Aldrin walked on the moon in 1969, there ______many space explorations.

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

答案B

解析句意：在1969年尼尔. 阿姆斯特朗和艾德文. 奥尔德林月球行走之前，人类就已经进行过许多次的太空探险。动词时态题。“by+时间状语”是完成时态的标志。如果by后接的是将来的时间，谓语动词用“will have+过去分词”；如果by后接的是过去的时间，谓语动词用“had+过去分词”的形式。根据句中的in 1969可知，本题应用过去完成时，表示过去的过去。故选B。

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本试题收录于：英语题库普高专升本分类

英语

普高专升本

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By the time Neil Armstrong and Edwin Aldrin walked on the moon in 1969, there ______many space explorations.

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