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选择正确答案,分析一下句子结构及意思.

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选择正确答案,分析一下句子结构及意思.
To learn the latest scientific and technical developments ( ) one of the aims that ( ) to be reached in learning foreign languages. A.are,is B.is,are C.is,is D.are,are
选择正确答案,分析一下句子结构及意思.
答案是B
To learn the latest scientific and technical developments (动词不定式做主语) IS (系动词) one (表语)of the aims (定语)that (定语从句部分的连接词,也是这个从句部分的主语)ARE to be reached (复合谓语)in learning foreign languages(地点/时间状语).
1 to learn -- - - is one of - -- - -
== to learn is one - -- - (单数性)
2 one of the aims that are - -- -
--------that are知道aims,不指代one
that== aims,所以是复数