题目内容：

现完练习.He has stayed home since the day before yesterday
He has stayed home since the day before yesterday.
"the day before yesterday"划线部分提问

优质解答

How long has he stayed home?
因为此句中的划线部分是表示一段时间的概念,所以要用How long来提问.译文是：他在家呆了多长时间?