对since 画线提问用什么词作疑问词?

Question

如题所述

Answer 1

如果划了since，要用how long
如果没划，要用since when

Answer 2

用问时间长短的词提问,如:how long,how many years/months等.

Answer 3

用how long

Answer 4

用how long。
例如：
题目是：I have been in the army since 1999.
提问应该是：How long have you been in the army?本回答被提问者采纳