The new books are of great use.They _well and _already.Asell,have been sold out B.sold,had sold outC.sell,sell out D.sold,have sold out选A为什么?

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The new books are of great use.They _well and _already.Asell,have been sold out B.sold,had sold outC.sell,sell out D.sold,have sold out选A为什么?
The new books are of great use.They _well and _already.
Asell,have been sold out B.sold,had sold outC.sell,sell out D.sold,have sold out
选A为什么?

The new books are of great use.They _well and _already.Asell,have been sold out B.sold,had sold outC.sell,sell out D.sold,have sold out选A为什么?
sell well里的sell是很特殊的用法,这里的well其实是一个形容词,不是副词,表示卖得很好,sell这里类似于一个系动词.
其次sell out卖出去.应该是被卖,表被动,所以用被动语态.

它们卖的很好应该用一般现在时,而有already是现在完成时的标志,且书应该是被卖,所以用现在完成时的被动语态

a
have been 是现在完成时的被动语态,符合提议.