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Old 08-26-2007, 11:47 AM   #1
ZBY
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BB p783#25

Could you guys explain why "was" must be replaced by "has been"?
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Old 08-26-2007, 01:57 PM   #2
Amu
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The second part of the sentence says, "North Americans have been exploring." You can't have two tenses different tenses, so 'was' must be replaced by 'has been.'
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Old 08-26-2007, 11:11 PM   #3
ZBY
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OH i see. Thanks
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