问题
How long have you been studying at this school? — I have been studying here____.
A:since I was thirteen years old
B:when I was thirteen
C:at the age of thirteen
D:after I was thirteen
B:when I was thirteen
C:at the age of thirteen
D:after I was thirteen
正确答案是：
同类题型
He is ______ is known as a hacker —- he likes to show off on the Internet and attack websites.
We _________ for a picnic if it _________ rain this Sunday.
Anna is _____ to work out the math problems and gets a good grade.
This is the city _____ I visited 10 years ago.[ ]
It hasn’t been decided yet _______ our wedding party will be held.