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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 这里考的是非谓语形式做定语的用法，即现在分词做problem的后置定语。如果用require就变成有两个谓语了。这里相当于用了定语从句：Which requires。
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