since then,there have been periodic attempts by Chinese and Taiwanese activists to sail to theisland.

中文since there is usually no soeaking in then But then /Before then / Since then/ Until 翻译：ever since then ever since then since then,there have been periodic attempts by Chinese and Taiwanese activists to sail to theisland. Mr Smith has gone to American 10years ago and has been there since then.A.has gone;since then B.went;from thenC.has gone;since ever D.came;ever since since then可以说成 since that time 从那以后是from then还是since then? since then 是啥意思? ----------------you----------------(know)him since then out there在这里什么意思?ever since then we've had some fantastic releases out there in the marketplace.与over there一样吗? 英语改错:I was a high school student then,from income family.So I hav since then 与since ever有什么区别? since then 和since that有什么区别? since then 与since ever有什么区别? Since that和 since then是一样的吗?为什么? since then后接什么时态 since then加一个一般疑问句吗