they exercise two hours a week.对two提问 ()()()do they exercise a week?
问题描述:
they exercise two hours a week.对two提问 ()()()do they exercise a week?
答
At what frequency
这里句子是问频率,次数
他们每周练习多少时间
那么就2小时
答
(How)(many)(hours)do they exercise a week?
答
对two提问,三个空子填(How)(many)(hours)
对 two hours 提问,两个空子填(How)(long)