work hard,是表示努力工作(学习)的固定搭配词组.
was 或者 had ,表示过去时间的时候可以加入,例如 he had been working hard,thus he succeeded.
或者,he was working hard,and he succeeded.
work hard,是表示努力工作(学习)的固定搭配词组.
was 或者 had ,表示过去时间的时候可以加入,例如 he had been working hard,thus he succeeded.
或者,he was working hard,and he succeeded.