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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

D

解析试题分析:本题考查非谓语动词,考查方式为非谓语动词形式选择。根据题干信息,非谓语动词在这里做定语,限定“要去解决的问题”。根据非谓语动词做定语的规则,现在分词表示主动和正在发生,过去分词表示被动或完成,而不定式表示将要发生,所以选D。
考点:考查非谓语动词的用法

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