Someresearchersarefindingthatdaydreamingmaybeimportant...

问题详情：

 Some researchers are finding that daydreaming may be important to ______ mental health and it is ______ good means of relaxation.

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

【回答】

C

知识点：冠词

题型：选择题