Question

Then she found that the tears _ a _ quietly __ from her eyes. Perhaps they __ for a long time, (to flow, to flow) (Murdoch)

Answer 1

Then she found that the tears were quietly flowing from her eyes.

Perhaps they had been flowing for a long time.

Answer 2

Then she found that the tears were flowing quietly from her eyes. Perhaps they had been flowing for a long time. (Murdoch)