218 Babies sleep 16 to 18 hours in every 24 hours ,and they sleep less __ they grow older .

问题描述:

218 Babies sleep 16 to 18 hours in every 24 hours ,and they sleep less __ they grow older .
A while B as C when D after

选B.as
as +从句,表示随着.
翻译:随着他们年龄的增长,他们睡得会更少.