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  3. The research scientists often meet with problems___________new types of instruments for their solution.

The research scientists often meet with problems___________new types of instruments for their solution.

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问题 The research scientists often meet with problems___________new types of instruments for their solution.
选项 A、require
B、to require
C、required
D、requiring
答案D
解析 分析句子结构可知，空处应用非谓语动词，作后置定语。不定式作后置定语表将来；现在分词作后置定语表主动或进行；过去分词作后置定语表被动或完成。又因为problems与require之间为逻辑上的主谓关系，所以应用现在分词形式表主动。故选D。
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