根据时态是可以排除ab的,B是现在完成的,而在句意是发生在过去的时间.
一般过去时有动作发生的时间点,即过去某一时间发生某一动作；现在完成时则没有,即不强调是哪个时间点发生的动作,而强调过去的动作对现在造成的影响和结果.
在他猜测时,已经去那里了,这是发生在过去的时间点的,且对现在是没有造成影响的
7.（2011北京卷,27）——That must have been a long trip.
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相关问题
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----That must have been a long trip.
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— That must have been a long trip.
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—That must have been a long trip.
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–-That must have been a long trip.
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That must have a long trip.
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—That must have been a lot of work.
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—That must have been a lot of work.
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关于must的反意疑问句She must have been there for a long time,____ __
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-That must have been a very hard time for you
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That must have been difficult for her,______?