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What did Franklin do in order to make an exact map?（2分）
AHe compared his own map with other maps.
BHe talked with many U.S. captains.
CHe used drifting bottles to check his map.
DBoth B and C.
AHe compared his own map with other maps.
BHe talked with many U.S. captains.
CHe used drifting bottles to check his map.
DBoth B and C.
参考答案