The research scientists often meet with problems_____new types of instrument for

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问题 The research scientists often meet with problems_____new types of instrument for their solution.

选项 A、requiring
B、required
C、to require
D、being required

答案 A

解析此题应选现在分词requiring，在句中作定语，修饰problems，相当于定语从句…problems which require...，因为它们在逻辑上是主动关系，所以应选现在分词。句意为：“科研人员常常遇到需要新型仪器才能解决的问题。”

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Theresearchscientistsoftenmeetwithproblems_____newtypesofinstrumentfor