杭州交通信息网极速浏览器的弹出窗口:关于since用法有点不清楚。
来源：百度文库 编辑：杭州交通信息网 时间：2024/04/29 13:39:29
This development has also accelerated ____ the civilian airlines were first
"deregulated(解除管制)", this is , allowed to compete with eacho other
for more routes and passengers,in the late 1970s.
[A] since
[B] after
我只记得since只能用于完成时，如果一个句子有主句有从句，那么这两个句子都要是
完成时才可以，是这样么？
1：但为什么这样我一直不理解。。。
2：如果是这样，后面得句子he civilian airlines were first deregulated
是过去时，也不是完成时啊。
这个since在做选择题时候老错，在和它意思差不多得词选择的时候，麻烦大家不忙时候讲讲
谢谢
"deregulated(解除管制)", this is , allowed to compete with eacho other
for more routes and passengers,in the late 1970s.
[A] since
[B] after
我只记得since只能用于完成时，如果一个句子有主句有从句，那么这两个句子都要是
完成时才可以，是这样么？
1：但为什么这样我一直不理解。。。
2：如果是这样，后面得句子he civilian airlines were first deregulated
是过去时，也不是完成时啊。
这个since在做选择题时候老错，在和它意思差不多得词选择的时候，麻烦大家不忙时候讲讲
谢谢
别浪费感情啊，没有人回答你得问题把分给我得了
since可以引导时间状语从句
引导时间状语从句一般放在后面。
指从说话前某一时刻到说话时刻这一段时间。常用于完成时态。
He has been living in Beijing since he was five.
五岁后一直住在北京。
I have learned English since you left.
你走了以后我就学了英语。