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According to common practice, the president _________ hold office for five years.
A.mustB.shallC.needD.will
B

试题分析:句意:按照惯例,董事长担任这个职务5年了。must必须; shall表示在条约、规章、法令等文件中表示义务或规定,一般用于第三人称,作“应”“必须”解。need需要; will意愿。根据句意故选B。
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