2. 外语
  3. In 1800 the northwest Acoast of North America Bis one Cof the world’s least explored Dareas.

In 1800 the northwest Acoast of North America Bis one Cof the world’s least explored Dareas.

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问题 In 1800 the northwest Acoast of North America Bis one Cof the world’s least explored Dareas.
选项 A、 
B、 
C、 
D、 
答案B
解析 Is is present tense where a past tense verb is needed . with the time marker 1800. Correction: was.
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