单选题
Since the Second World War, most urban growth in the United States has occurred ______ of existing metropolitan areas.
A、
on the outskirts
B、
on the outskirt
C、
on outskirts
D、
on outskirt
【正确答案】
A
【答案解析】
on the outskirts of...是固定搭配，意为“在……郊区”。
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