Hi ,i see you are giving a lecture again!what's it about wel

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 18:30:50

Hi ,i see you are giving a lecture again!what's it about well,( ）the chat room ten minutes ago,
you would have known what we were talking about!
a ;had you joined b;if you joined c;were you to join d;if you should join

第二句话的意思是,如果你十分钟之前进聊天室的话就能知道我们在说什么了,这是一个对过去的虚拟条件句,由后面的would have known 可知前面应该用过去完成时,完整的应该是if you had joined ,但省略了if 的话就要把had 提前,所以选a .就这样.多看看关于虚拟语气和情态动词的语法会好一点.

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