20．—Though it is 30 years we last met I still remember the scene we got separated on a

问题补充：

20．—Though it is 30 years we last met, I still remember the scene we got separated on a rainy day.

A. since; where

B. before; which

C. since; when

D. before; where

答案：

(答案→)A. since; where

B. before; which

C. since; when

D. before; where

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