She must have studied English before.
她以前一定学过英语。
Medical researchers have studied the health benefits of the new tea.
医学研究人员研究了这种新茶的健康功效。
你一定学得很好！
You must have studied very hard.
你一定学习很刻苦。
I have studied in the school for one year.
我在这所学校学习了一年了。
We have studied here since 2003.
我们自2003年来就在这儿读书了。
We have studied English for years.
我们学英语已有好几年了。
I have studied English for six years.
我学习英语已经六年了。
We have studied for 5 hours straight.
我们已经连续学习了5个小时。
I have studied English for many years.
我已经学英语很多年了。
I have studied English for four years.
我学英语已经有四年了。
We have studied English for six years.
我们学习英语已经6年了。
I have studied English since last year.
我自去年开始学习英语。
I have studied English for three years.
我学习英语已有三年了。
We have studied English for three years.
我们学英语已三年了。
I have studied in this school for six years.
我已经在这个学校学习六年了。
We have studied English for more than 2 years.
我们学英语已有两年多时间了。
I have studied ballet for more than eight years.
我学过八年的芭蕾舞了。
They have studied English since they were eight.
他们从八岁起就开始学英语了。
We have studied English for more than ten years.
我们学英语已经10多年了。
I have studied English at this school since 1998.
我自从1998年起就在这所学校学习英语。
They have studied so hard to realize their dreams.
他们努力学习来实现梦想。
Economists have studied how markets work for a long time.
经济学家长期以来都在研究市场如何运作。
NASA scientists have studied Earth long enough to know this.
美国宇航局(NASA)的科学家们长期研究地球，对此了如指掌。
By next Friday, he will have studied here for three years.
到下周五，他在这里学习就要满3年了。
Nevertheless, scientists have studied the fruit's properties.
尽管如此，科学家们研究了水果的属性。
He is said to have studied hard and passed the examination.
据说他学习一直很用功并通过了考试。
He is said to have studied hard and passed the examination.
据说他学习一直很用功并通过了考试。
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