The conference will not begin until every one of students' parents____.

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问题 The conference will not begin until every one of students' parents____.

选项 A. have been on
B. got here
C. has showed up
D. come

答案C

解析考查主谓一致和时态。根据后面的every one of…可以判断谓语动词要用第三人称单数,排除A 和D。根据句意,这里是说家长到了会议才开始,强调动作的完成,要用完成时,故选C。
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