单项选择题

______ in the United States, St. Louis has now become the 24th largest city.

A. The fourth biggest city it was
B. Once the fourth biggest city
C. Being the fourth biggest city
D. It was once the fourth biggest city

<上一题目录下一题>

热门试题

单项选择题

If English is not our first language, you can often be puzzled by ways of expression that the native speakers of English does not even have to ______

A. think out
B. think about
C. think over
D. think for

单项选择题

Speciation, ______, results when an animal population becomes isolated by some factor, usually geographic.

A. form biological species

B. biological species are formed
C. which forming biological species
D. the formation of biological species

相关试题