According to a new study by a British university learning second language can lead to i

问题补充：

According to a new study by a British university, learning second language can lead to increase in your brain power.

A. a; the

B. / ; the

C. a; an

D. the; an

答案：

A. a; the

B. / ; the

(答案→)C. a; an

D. the; an

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