Some researchers are finding that daydreaming may be important to ______ mental health. Daydreaming, they say, is ______ good means of relaxation.

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

Some researchers are finding that daydreaming may be important to     mental health .Daydreaming ,they say, is      good means of relaxation.

Some researchers are finding that daydreaming may be important to ______ mental health. Daydreaming, they say, is ______ good means of relaxation.

Some researchers are finding that daydreaming may be important to     mental health .Daydreaming ,they say, is      good means of relaxation.

Some researchers are finding that daydreaming may be important to ____ mental health. Daydreaming, they say, is ____ good means of relaxation.

A. the; /　　　　　 B. /; the　　　　 C. /; /　　　　　　　 D. /; a