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20.The elderly lady wonders if her long lost son can still be back alive.Such things ____ and do happen.(  )
A.canB.mustC.willD.need

分析 这位年长的女士想知道她失踪多年的儿子是否还能活在回来.这样的事情有可能也确实发生过.

解答 答案:A
题干中wonders if her long lost son can still be back alive表达不确定的事情;can用来表达不肯定的推测;must一定,必须,will会,need需要;句意表达的是推测.故选A.

点评 本题考查情态动词表示推测的用法.英语中may,can,must表示推测:对现在情况的推测,用情态动词加动词原形;对过去的推测用情态动词加完成时态.

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