----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a long time ( ) we see each other again.A before since B since when C
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----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a long time ( ) we see each other again.A before since B since when C
----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a
----It's a long time ( ) I saw you last.
----Yes,and what a pity it is now that it will be a long time ( ) we see each other again.
A before since B since when C since before D when before
Many people consider it ( ),from which a lot of children benefit.
A a worth doing cause B a cause worth to do
C a worthwhile cause D a worthless cause
----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a----It's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a long time ( ) we see each other again.A before since B since when C
1 C
since 自从...题目意思是“自从上次见你之后已经过一段时间了（很久没见了）”.
before ...之前 题目意思是“太遗憾了,下次我们再见（之前）要过一段时间了”.
2 C
A 应该是 cause worth doing B 同A
C worthwhile adj.值得去做的...D worthless 不值得做的 与题意不符.