The two sides have reached a partial agreement but several differences still between the

问题补充：

The two sides have reached a partial agreement, but several differences still between them.

A. happen

B. exist

C. survive

D. appear

答案：

A. happen

(答案→)B. exist

C. survive

D. appear

解析：动词辨析。A发生；B存在；C幸存；D出现；句意：双方已经达成部分协议，但是几个争议之处仍然存在于双方。