(2013·温州模拟)Telephone users sometimes plain about unreliable service and they consider unfair charges.
A. which
B. that
C. what
D. how
网友回答
A. which
B. that
C. what
D. how
解析：选C。考查宾语从句。句意: 电话用户有时候投诉不靠谱的服务和他们认为不公平的收费。此处and后面的句子为介词about的宾语从句, 根据consider的双宾语现象推知用连接词what作动词的宾语。