had been doing是过去完成进行时态过去完成进行时就是相对过去的某个时刻来说已经对现在有直接影响并且还在进行的动作。
例句
His king had been checkmated.
他的王棋已被将死。
The photograph had been framed.
照片已镶了框。
He had been abroad many times.
他曾多次出国。
Her instincts had been right.
她当时的直觉是对的。
The votes had been miscounted.
票数计错了。
