The government has been working to secure the release of the hostages.
政府一直在努力争取使人质获释。
Professor Bonnet has been working for many years on molecules of this type.
博内特教授多年来一直在研究这类分子。
Family Health International has been working on public health issues since 1971.
国际家庭健康组织自1971年以来一直致力于公共健康问题。
Mary has been working at the dress shop since 1994.
自1994年以来，玛丽一直在那家服装店工作。
他工作太辛苦了。
He has been working since noon.
他从中午就开始工作了。
He has been working very hard.
他一直都很努力。
他近来在加班工作。
他已工作了一整天。
He has been working hard all day.
他辛苦工作了一整天。
He has been working hard for a long time.
他已经努力了很长的时间。
She has been working here for three years.
她在这里工作了三年。
He has been working in the lab for two hours.
他已经在实验室里工作了两个小时。
He has been working on this painting for days.
这张画他已画了好些天了。
He looks very tired. He has been working all day.
他很累。他干了一整天活。
He's very tired; he has been working hard all day.
他很累；他整天都在努力工作。
He has been working on his new book in recent days.
近来他一直忙着写他的新书。
For all these years he has been working for others.
这么多年来，他一直是在给别人打工。
He has been working here since this time last year.
他从去年的这个时候就在这里工作了。
To be fair, he has been working very hard recently.
公平地说，他最近工作一直非常努力。
He is badly ill because he has been working too hard.
他因为过分劳累而病情严重。
She has been working in the World Bank for four years.
她在世界银行工作四年了。
He has been working here ever since he left university.
自从大学毕业以后，他就一直在这里工作。
The mechanical stirrer has been working for several hours.
这台机器搅拌器已连续工作好几小时了。
This electric generator has been working for several hours.
这台发电机已运转了几个小时。
He has been working overnight. No wonder he looks worn out.
干了一整夜，难怪他看上去很疲倦。
He has been working overnight. No wonder he looks worn out.
干了一整夜，难怪他看上去很疲倦。
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