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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.
admin
2015-11-04
29
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
非谓语动词题。句意:研究专家们常常会遇到需要运用新型仪器来解决的问题。这里考查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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