He is the only one of the students who ______ finished the task in time.

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问题 He is the only one of the students who ______ finished the task in time.

选项 A、have
B、has
C、is
D、are

答案B

解析 在定语从句中,关系代词作从句中的主语时,其谓语的“数”要和先行词的“数”保持一致。本句中由于one有the only修饰,所以先行词是one,而不是of后面的students,who引导的定语从句谓语动词跟one一致,用单数;如果没有the only修饰,那么先行词则是of后面的复数名词students。比如: He is one of the students who have finished the task in time。此时,who引导的定语从句谓语动词应该跟 students一致,用复数。
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