Question

____ in the United States, St Louis has now become the 4^th largest city.

A．It is the 24th biggest city

B．It was the 24th biggest city

C．Before the 24th biggest city

D．Once the 24th biggest city

Answer 1

D

试题分析：句意：那是St Louis是美国排名第24的大城市，而如今它已成为排名第4的大城市。句子中间用逗号隔开，说明整个就是一个句子，那就不能存在两个谓语，除非其中一个是从句，所以去掉A、B两个答案，再根据句意，故选D。