The new dictionaries are very useful.They _well and _alr

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The new dictionaries are very useful.They ___well and ___already.
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
为什么不是B

sell是一个特殊的谓语,sell是“卖”的意思,有及物动词和不及物动词两种用法 1）及物动词时
主动语态是sb sell sth,某人卖某物
被动语态就是sth be sold by sb ,某物别某人卖
2)不及物动词时
常用sth sell well表示某物卖的非常受欢迎
我想你不明白的应该是sth sell well这个用法吧,这里表示的是某物卖的好,因为they是指的是某物,是不及物动词用主动形式,相同的还有taste.
sth taste good
因为前面的谓语是用的are,其实前面的一句话就是一个信息,提醒你这句话应该用现在式,其实做选择题的时候,不要小看了一些辅助的话,他就给你提供了信息,很关键,单项选择题的每句话都相当的重要,还有就是有already做提示是现在完成式的标志,首先B的时态就是错误的首先排除
第一空填sell 我前面已经解释的非常清楚了
后面的两个谓语的主语都是they 当然第二空应该用现在完成被动式,
我想我已经讲的非常清楚了,希望对你有所帮助!

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