W hen we got to the cinema the tickets have been _____(卖完).have been 不是加doing吗？为什么可以加sold
问题描述：
W hen we got to the cinema the tickets have been _____(卖完).
have been 不是加doing吗？为什么可以加sold
答
sold out
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答
sold out
答
sold out
问题补充：
have been 不是加doing吗?为什么可以加sold
---have been doing 是“现在完成进行时”
而 这里是现在完成时的被动语态