______personnel are required to participate in professional development programs and to submit program evaluations.

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问题 ______personnel are required to participate in professional development programs and to submit program evaluations.

选项 A、Some of
B、Every
C、Most
D、All

答案D

解析 本题需选择修饰personnel的限定词。some用于“some of the/this/those十名词(可数名词复数)”的结构,every用于“every+名词单数”的结构。most和all后跟复数名词时可不带冠词。句意应为“全体员工应该···”,故选(D)all。若选(C),句意就变成“大部分员工应该…”,导致履行义务的对象不明确。
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