Americans often say that there are two things a person______in life: death and tax.

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问题 Americans often say that there are two things a person______in life: death and tax.

选项 A、can be sure of
B、should be sure of
C、must be sure of
D、must be sure about

答案A

解析 语法类试题(情态动词和形容词搭配)。can be sure of意思为“可以肯定的”。
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