Question

1．-Have you known Mr．Li for a long time？
-Yes，since he _________ the club．（　�。�

• A． has joined
• B． joins
• C． will join
• D． joined

Answer 1

分析 ---你認(rèn)識李先生很久了？
---是的，自從他加入俱樂部．

解答 答案：D．結(jié)合句意是說自從他加入俱樂部就認(rèn)識了，加入join動作發(fā)生在過去，故用一般過去時，故答案是D．

點評 since的四種用法1）since+過去一個時間點（如具體的年、月、日期、鐘點、1980，last month，half past six）．例如：
I have been here since 1989.1989起，我一直在這兒．
2）since+一段時間+ago．例如：
I have been here since five months ago．我在這兒，已經(jīng)有五個月了．
3）since+從句．例如：
Great changes have taken place since you left．你走后，變化可大了．
Great changes have taken place since we were here．我們走后，變化可大了．
4）It is+一段時間+since從句．例如：
It is two years since I became a postgraduate student．我考上研究生有兩年了．