According to a German professor, the soreness comes from straining your muscles in an uncommon way, for example, jumping on a bicycle for a ride, because you haven't ridden in a long time.
2019年12月四级真题（第一套）听力 Section C
I cant seem to focus on anything, because 1 still haven't decided if I should accept the offer for that PhD program in London, or if I should take the job offer in New York.
2019年12月四级真题（第二套）听力 Section B
I haven't been abroad for a long while.
2017年12月四级真题（第一套）听力 Section B
We haven't got enough time to get there.
2018年6月四级真题（第二套）听力 Section B
"middle school is an important age because students have enough math capability to solve advanced problems, but they haven't really decided what they want to do with their lives," said Loh.
2017年6月六级真题（第三套）阅读 Section B
But many widely anticipated changes weren't quick, and some haven't really started.
2019年6月六级真题（第一套）阅读 Section B
Machines can't handle things they haven't seen many times before.
2018年12月六级真题（第二套）听力 Section C
But I haven't finished even half of it.
2015年高考英语湖北卷 听力 原文
I haven't heard from my sister for two weeks.
2017年高考英语浙江卷（11月） 听力 原文
In fact, I haven't got much sleep this past week, and I feel really tired.
2015年高考英语全国卷2 听力 原文
Oh, that's good news! We haven't seen them for ages.
2016年高考英语全国卷2 听力 原文
Sorry I haven't got better weather news for you holidaymakers.
2016年高考英语浙江卷（10月） 听力 原文
That's how we found our home and how I learned that when people are kind, they are not strangers, only friends we haven't yet met.
2015年高考英语天津卷 完形填空 原文
The fact that such practices remain officially unaccepted reflects how far we haven't come as a society from the days when we expected every full-time worker to be supported by a full-time homemaker.
2016年高考英语浙江卷（10月） 阅读理解 阅读C 原文
We haven't had any guests since we moved in here.
2016年高考英语全国卷2 听力 原文
We still haven't received the thirty chairs.
2016年高考英语浙江卷（10月） 听力 原文
You haven't changed a bit after all these years.
2015年高考英语重庆卷 单项填空 原文
You've just written a new one, haven't you?
2015年高考英语上海卷 听力 原文
Sellers that use eBay and Etsy, which provide platforms for smaller sellers, also haven't been collecting sales tax nationwide.
2020年考研真题（英语一）翻译 Section Ⅲ
The best uses of 3 D printers and virtual reality haven't been invented yet.
2018年考研真题（英语一）阅读理解 Section Ⅱ
Those who jumped without a job haven't always landed in top positions quickly.
2011年考研真题（英语一）阅读理解 Section Ⅱ