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

試題分析：句意：按照慣例，董事長擔任這個職務(wù)5年了。must必須； shall表示在條約、規(guī)章、法令等文件中表示義務(wù)或規(guī)定,一般用于第三人稱,作“應(yīng)”“必須”解。need需要； will意愿。根據(jù)句意故選B。
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