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  3. The research scientists often meet with problems ________ new type of instruments for their soluti

The research scientists often meet with problems ________ new type of instruments for their soluti

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问题 The research scientists often meet with problems ________ new type of instruments for their soluti
选项 A、require
B、to require
C、required
D、requiring
答案D
解析 分词短语作定语。由于它和先行词problem是主动关系，因此选现在分词。句意：科研人员经常遇到需要新型仪器来解决的问题。
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