I saw Janson yesterday.We haven't seen each other since we left Beijing.这句话用现在完成时对吗?为什么这句话却用过去完成时I saw Li Lei yesterday.We hadn't seen each other since I left Beijing.

问题描述:

I saw Janson yesterday.We haven't seen each other since we left Beijing.这句话用现在完成时对吗?
为什么这句话却用过去完成时I saw Li Lei yesterday.We hadn't seen each other since I left Beijing.