Peter was so excited he received an invitation from his friend to visit
Chongqing.
A. where
B. that
C. why
D. when
网友回答
A. where
B. that
C. why
(答案→)D. when
解析：考查连词：句意：当皮特收到朋友到重庆游玩的邀请的时候，他感到很高兴。所以这是个时间状语从句，用when引导时间状语从句。where引导地点状语从句，that引导的是结果状语从句，why是为什么，都不符合句意。选Ｄ。