问题
选择题
Babies sleep l6 to l8 hours in every 24 hours, and they sleep less ________ they grow older.
A．while
B．as
C．when
D．after
答案
答案：B
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Babies sleep l6 to l8 hours in every 24 hours, and they sleep less ________ they grow older.
A．while
B．as
C．when
D．after
答案：B