There are still many problems ______ bef...

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

A. solvingB. solved

C. being solvedD.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

考点分析：

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