__________ in the United States,

来源：百度知道 编辑：UC知道 时间：2024/07/05 01:21:12
__________ in the United States, St.Louis has now become the 24th largest city. [A] Once the fourth biggest city [B] The fourth biggest city it was
[C]Being the fourth biggest city [D]It was once the fourth biggest city
为什么选A？并翻译整句

A
曾经是美国第四大城市的圣路易斯已经成为了第二十四大城市
主谓一致 前面把圣路易斯省略了

摇篮到后面的St.Louis has now become the 24th largest city，现在是美国第二十四大城市，那么推理得知只可能是“以前曾经是美国第四大城市”了

Once曾经

这里要填一个非谓语，因为St.Louis has now become the 24th largest city已经是一句完整的话。