We spent half an hour writing it.(提问）____ ____ ____ you ____ writing it?(___代表空格）
问题描述：
We spent half an hour writing it.(提问）____ ____ ____ you ____ writing it?(___代表空格）
答
how long did you spend writing it???
答
How long did spend
答
how long did you spend writing it?
答
How long do spent