Question

【题目】Tom has had the toy dog since he was four years old. (就句子划线部分提问)

________has Tom had the toy dog?

Answer 1

【答案】How long

【解析】

句意：Tom什么时候有的玩具狗？

since+时间的划线提问用how long问时间多久（用于现在完成时用询问时间多久）来代替。故答案填How long。