When_____they____(put up)these signs?
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When_____they____(putup)thesesigns?When_____they____(putup)thesesigns?When_____they____(putup)theses
When_____they____(put up)these signs?
When_____they____(put up)these signs?
When_____they____(put up)these signs?
When do they put up these signs? 意思是他们什么时候捡起来这些广告牌.
这道题前面考的应该是区别do and does
后面考的应该是不定式吧,毕业太多年了,仅供参考.
When did they put up these signs?