Question

It's not what you do once in ____ while but what you do day in and day out that makes ____ difference.

A．the ; /

B．/ ; a

C．a; a

D．the; a

Answer

C

【解析】考查冠词。固定词组in a while="in" a moment="in" a minute="soon=at" once="right" away 立刻 马上；make a difference有影响，起作用；day in and day out每天，一天又一天；本题是一个强调主语的强调句型。句意：起作用的不是你马上要做的事情而是你每天所做的事情。