...sp;since前面的句子可以采用过去完成时态had done:Since the party she had only spoken to him once.(那次派对之后,她只和他说过一次话。)B. was + since + had done:since后边的从句也可以用过去完成时态:It was&...
The staff (are urging / urged / were urging) employers to invest more money in training. (urge) 请问老师,括弧里的动词时态都对吗?为什么?除此之外,还有哪些时态可以用。如何判断哪个时态是最恰当的?非常感谢。