With the help of the space-shuttle-carried radar, archeologists found "They" in the second line of the last paragraph refers to

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问题 With the help of the space-shuttle-carried radar, archeologists found
"They" in the second line of the last paragraph refers to

选项 A、old New England fences.
B、the stretch of walled fields.
C、the expedition members.
D、ancient villages.

答案B

解析

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