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Nobody knows how people first came to these islands. They must have come from South America on rafts.
Nobody knows how people first came to these islands. They must have come from South America on rafts.
admin
2011-07-28
54
问题
Nobody knows how people first came to these islands. They must have come from South America on rafts.
选项
答案
must——might
解析
前半句强调“无人知道”,因此后半句应当是不肯定的推测,用might have done。must have done是肯定推测,与句意不符。
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专业英语八级
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