In 1800 the northwest Acoast of North America Bis one Cof the world’s least expl

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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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