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is natual,a man as old as he can be very forgetful

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is natual,a man as old as he can be very forgetful
As is natural,a man as old as he ____ be very forgetful.
A.can B.should
应该选A.表示可能推测?那我选Bshould表示像他这个年纪的人“理论上应该”都很健忘.不是很对吗.should不是有表示理论上应该的意思吗
A,
can 在这里表“理论上的可能性”,这个语言点在高中阶段可说也是热点之一,一定记住.
再如:
Swimming across the river can be very dangerous.
再问: 那should到底有没有理论上应该的意思啊。我们老师有讲过这个哦。。晕了
再答: should 表推测时,一般指具体某一回 “应该"怎么样 如: He started out early this morning, and now he should be there. 他今天一大早就动身了, 现在应该到了。