We should follow one of the terms in the contract signed by the employer and the employee a one-week notice should be given if an employee is to be dismissed.
A. that
B. which
C. when
D. who
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(答案→)A. that
B. which
C. when
D. who
解析：考查同位语从句。that引导同位语从句，是对one of the terms“条款之一”进行补充说明，是同位语从句。故选A。