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
What’s this?—It’s a machine which was invented in __________century in China.
You will _______ if you _______ late again, I think.
The Math problem is too difficult , we really don’t know ________ to do it .
The student is too young. He can’t look after himself _______.
I’d like to help homeless people, so I could ________ food at the food bank.