2. 外语
  3. Betty is the only one of the students who______to represent the group.

Betty is the only one of the students who______to represent the group.

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问题 Betty is the only one of the students who______to represent the group.
选项 A、have been chosen
B、has been chosen
C、have chosen
D、has chosen
答案B
解析 主谓一致题。若关系代词在定语从句中作主语，定语从句谓语动词的单复数形式应与先行词保持一致：当先行词为one of+复数名词时，定语从句所修饰的是复数名词，所以定语从句的谓语动词用复数形式；当先行词为the only one of+复数名词时，定语从句所修饰的是the only one，所以定语从句的谓语动词用单数形式。原句的先行词是the only one of the students，所以who引导的定语从句的谓语动词用单数形式，故应选[B]，同时排除选项[A]和[C]；定语从句的谓语动词choose是及物动词，其后必须跟宾语，而原句choose之后没有宾语，由此可知choose应用被动语态，故排除选项[D]。
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