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【题目】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

【答案】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

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