What an unforgettable experience! I'll write it downit is still fresh in my memoryA. sinc

问题补充：

What an unforgettable experience! Ill write it downit is still fresh in my memory．

A. since

B. while

C. after

D. until

答案：

A. since

(答案→)B. while

C. after

D. until

解析：A．since自从B．while 当…时候，虽然，然而，C．after在…后面D．until直到，句意：多么令人难忘的经历啊！我会趁还记忆犹新把它写下。选B。