13. The voyage diaries were handed down by his great grandfather, so their brothers have kept them as ____ .
A.the apple in their eyes B. the apple of their mouths
C.the apple of their eyes D. an apple of their eyes
13. The voyage diaries were handed down by his great grandfather, so their brothers have kept them as ____ .
A.the apple in their eyes B. the apple of their mouths
C.the apple of their eyes D. an apple of their eyes
C