Lee __________ (learn) English for several years,and at last he _________ (master) the irregular verbs.

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Lee __________ (learn) English for several years,and at last he _________ (master) the irregular verbs.

Lee __________ (learn) English for several years,and at last he _________ (master) the irregular verbs.
Lee __________ (learn) English for several years,
and at last he _________ (master) the irregular verbs.

Lee __________ (learn) English for several years,and at last he _________ (master) the irregular verbs.
has learned
mastered

learned
mastered

Lee has been learning English for several years 要进行式! 因为他没停止学习啊
mastered

has learned , for+一段时间用完成时
mastered, at last说明用过去时