Peterwassoexcited

问题详情：

Peter was so excited ________ he received an invitation from his friend to visit Chongqing.

【回答】

when　句意：当彼得收到朋友请他去重庆的邀请时非常激动。句中when引导时间状语从句。

知识点：状语从句

题型：阅读填空