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The new books are of great use, they well and already. A. sell : sell out B. sol

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The new books are of great use, they well and already. A. sell : sell out B. sol

The new books are of great use, they _____ well and _____ already.

 A. sell : sell out   B. sold : had sold out   C. sold : have sold out  D. sell : have been sold out

试题答案

D