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According to a new survey carried out by an American university, learning______ second language can result in_______ increase in the power to learn your native tongue.
A．a(chǎn); theB．不填; theC．a(chǎn); anD．the; an
C
“a second language”泛指一們第二外語(yǔ); 后面的increase作名詞講, 是可數(shù)名詞, 前面需加不定冠詞an。
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