对three years ago提问

Question

按要求改写下列句子（加分!）
1.He has been working for five hours（对划线部分提问）
2．My brother joined the League three years ago． （对划线部分提问）
3．I slept for nine hours last night． （对划线部分提问）
4．Of all the subjects,I like English best．(同义转换)
5．I’ve been skating since I was seven years old． （对划线部分提问）

Answer 1

同学,请把划线部分标出来好吗?
我自己猜了一下,应该是这样改写的：
1.He has been working for five hours
How long has he been working? （对for five hours 提问）
2．My brother joined the League three years ago．
When did your brother join the League? (对three years ago提问）
3．I slept for nine hours last night．
How long did you sleep last night? (对nine hours 提问）
4．Of all the subjects, I like English best．
Of all the subjects, I like English most. (对best 转换）
5．I’ve been skating since I was seven years old．
How long have you been skating? （对since I was seven years old提问）