Childrenshouldhaveatleast 

问题详情：

Children should have at least  ________ at night.

A．eight­hours sleep  

B．eight hour’s sleep

C．eight­hours­sleep 

D．eight hours’ sleep

【回答】

D　点拨：本题用语法判定法解题。以­s结尾的复数名词变所有格时直接加“‘”即可。

知识点：构词法

题型：选择题