Without animals and the information the animals gave, it______man much longer to go into space.

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问题 Without animals and the information the animals gave, it______man much longer to go into space.

选项 A、would take
B、took
C、had taken
D、would have taken

答案D

解析 虚拟语气题。本题为虚拟语气,由于人类现在已经步人太空,本句是针对过去的虚拟语气。主句用would have done的形式。
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