Childrenshouldhaveat的精選

問題詳情：Childrenshouldhaveatleast ________atnight.A．eight­hourssleep  B．eighthour’ssleepC．eight­hours­sleep D．eighthours’sleep【回答】D點撥：本題用語法判定法解題。以­s結尾的複數名詞變所有格時直接...