About _________ of the engineers in my company seem to be in their _________.
A：second-nines; forties
B：two-ninths; forties
C：second-ninths; fortieth
D：two-ninths; fortieth
酉+____=____ 奉+____=____ 工+____=____
爰+____=____ 俞+____=____ 每+____=____
皮+____=____ 尤+____=____ 包+____=____
