题目内容

This kind of CD-ROM is very popular. Why not buy one before it___________?
A. comes out        B is come out       C. is sold out      D. sells out
C
根据上下文的内容,本题选用的内容为sell out表示卖完的意思,相当于及物动词,可以有被动语态,故选答案为C
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