Within the arid regions (in which) their culture developed, the Bedouin camel-breeding tribes have maintained a distinctive patt

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问题 Within the arid regions (in which) their culture developed, the Bedouin camel-breeding tribes have maintained a distinctive pattern and a dominant position (over) other societies and (settlements) (through) virtue of their ability to exploit brazing r

选项 A、in which
B、over
C、settlements
D、through

答案D

解析 应改为by
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