■一道初中英语题(说理由)

问题描述:

■一道初中英语题(说理由)
upon arriving home the girl discovered that she ______ her bag at her friend's
A.left B.had left C.forgot D.had forgot

B
把东西忘在某个地方用left.
一回到家女孩想起她把包落在朋友家了
应该用过去完成时