DAVID HELPS HIS MOTHER WITH HER HOUSEWORK EVEY SATURDAY FOR ABOUT __.A:ONE AND HALF HOURS
问题描述：
DAVID HELPS HIS MOTHER WITH HER HOUSEWORK EVEY SATURDAY FOR ABOUT __.A:ONE AND HALF HOURS
B:A HALF AND AN HOUR C:AN HOUR AND A HALF D:ONE AND A HALF HOURS
答
D:one and a half hours 一个半小时
C.如果前面的an改为one才是对的.这种句式“一个小时”不能用an hour,而要用one hour.