I have heard a lot of good things about you( )II have heard a lot_英语解答

I have heard a lot of good things about you( )I
I have heard a lot of good things about you( )I came back from abroad.
答案是since ,为什么不用before?

人气：241 ℃　时间：2019-10-15 08:30:58

解答

since是从我从国外回来起,直到现在,所以用现在完成时,如果用before,时态应改为过去完成时,即had heard