The new dictionaries are very useful. They well and already.A. sell; have been sold outB.

The new dictionaries are very useful. They well and already.
A. sell; have been sold out
B. sold; had sold out
C. sell; sell out
D. are sold; have been sold out

(答案→)A. sell; have been sold outB. sold; had sold outC. sell; sell outD. are sold; have been sold out解析：某些可和well，easily等副词连用的不及物动词，如read，write，wash，sell等，可以主动语态表示被动含义，第一空就是这种用法，意思是它们很畅销。由副词already（已经）可知第二空用完成时态，意思是它们已经被销售完。故选A。

我明天再问问老师，叫他解释下这个问题