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
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单项选择题
A．reactB．reflectC．reduceD．repel
A．react
B．reflect
C．reduce
D．repel
单项选择题
According to Mark Doyle, Africa is so poor
A．because of the systematic exploitation of Africans.
B．because of the unfavorable climate.
C．because the donation in the past didn’t work.
D．because of the war.
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