They have been working for two hours.
现在完成进行时.
表示截止现在,他们已经工作2小时（并仍在继续工作）.
They have worked for two hours.
现在完成时.
表示他们已经工作了2小时,但不见得仍在继续工作.
他们已经工作两个小时了.They have been working for two hours.They have w
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