Recently some studies have found that learning ____________ second language can lead to _______________ increase in one’s brain power.

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

Recently some studies have found that learning ____________ second language can lead to _______________ increase in one’s brain power.

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

Recently some studies have found that learning ___________ second language can lead to __________ increase in one’s brain power.

Recently some studies have found that learning ____________ second language can lead to _______________ increase in one’s brain power.

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

Recently some studies have found that learning ___________ second language can lead to __________ increase in one’s brain power.

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