The conference will not begin until ever

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问题 The conference will not begin until every one of students' parents____.A. have been on B. got here C. has showed up D. come

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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