The new dictionaries are very useful．They ________ well and ________ already．
A.sell; have been sold outB.sold; had sold outC.sell; sell outD.are sold; have been sold out在线课程A
sth．sell well．“某物畅销”。这里的sell是不及物动词，表示事物本身的特性。这类由及物动词转变为不及物动词，用来表示事物本身具有的特性的词，还有close, break等。
这类词后常用well, easily来修饰。
例如：
The door closes well．
门关得严丝合缝。
The material breaks easily．
这种材料容易断。