it is the third time i __him this monthhad seenseesawhave seen

问题描述:

it is the third time i __him this month
had seen
see
saw
have seen

第四个

have seen
it is the **time +完成时

have seen
第几次做某事 用完成时态,而前边IT IS 则规定了是现在时,所以用现在完成时