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

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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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