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【单选题】

There are still many problems _________ before we are ready for a long stay on the Moon.

A、solving
B．solved
C．being solved
D．to be solved
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根据网考网移动考试中心的统计，该试题：

8%的考友选择了A选项

21%的考友选择了B选项

4%的考友选择了C选项

67%的考友选择了D选项

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