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    Nobody knows how people first came to these islands. They _____ from South America on rafts.
    A .must have sailed　
    		B. can sail　
    C. might have sailed
    		D. should have sailed
    C
    考察虚拟语气。根据上文，没有人知道人们第一次是怎么到达这些岛上的。可知下文猜测的事情发生在过去以前，故需用过去完成时态。Must表示必须、一定；might表示可能；should表示应该。根据上文可知不是很确定，故选C，他们可能成木筏从南美洲过来。
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