问题
选择题
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
答案
答案：D
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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
答案：D