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; the     B.不填; the     C. a; an    D. the; an

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; the     B.不填; the     C. a; an    D. the; an

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; the     B.不填; the     C. a; an    D. the; an

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; the     B.不填; the     C. a; an    D. the; an

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.

1. A.
   a; the
2. B.
   不填; the
3. C.
   a; an
4. D.
   the; an