When they will start _____ not been decided yet.A.have b.is c.does d.has问什么?为啥不用
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When they will start _____ not been decided yet.A.have b.is c.does d.has问什么?为啥不用
When they will start _____ not been decided yet.A.have b.is c.does d.has
问什么?为啥不用
When they will start _____ not been decided yet.A.have b.is c.does d.has问什么?为啥不用
主语是when will they start 他们什么时候开始,这一件事情,用第三人称
D
When they will start 是主语,have been done 的用法 表示目前还没有决定。
D他们什么时候出发尚未定下来。When they will start 做表抽象意义的主语,看做单数。
has 名词性从句做主语
has
意思说:他们何时出发现在还没定。 现在还没=have not been done 主语不是they,而是When they will start 这个事,所以用has not been done 。