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Nowadays it’s very useful ______ a foreign language.
A.learnB.learnedC.to learnD.learns
C

试题分析:句意:当今学习外语非常有用。强调句式, It is adj for sb to do sth,做某事对某人来说怎么样。本句中it是形式主语,指代后面不定式内容做形式主语,故选C。
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