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【单选题】

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

B．must be
C．had been
D．must have been
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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

1%的考友选择了B选项

79%的考友选择了C选项

13%的考友选择了D选项

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