题目内容
用since或before填空
I haven’t seen my sister for 4 months ________ I last saw her．
Why didn’t you go with him, ________ you were eager to leave here?
It is 12 years ________ my brother joined the army．
It was half a year ________ everything returned to normal after the flood．
It will be 3 weeks ________ we have a vacation．
