My mother often asks me to eat ( )apple( )day冠词填,后面的空是用the 还是 a

My mother often asks me to eat ( )apple( )day
冠词填,后面的空是用the 还是 a

an a
后面一个表示每一天

a

an,a 意思是：一天一个苹果

My mother often asks me to eat an apple a day