英语四级作文高分句型解析:
I am writing to you to complain about the service of your local express, which turned my trip last week a nightmare. 我写信是为了向您投诉普通快车的服务,它把我上周的旅程变为了一场噩梦。
点评:这是一个由which引导的非限制性定语从句,which指代的是the service of your local express。此外,还需注意一个句型I am writing to you to complain about…表示“我写信是为了向您投诉……”。