1.Only one of the middle school students that ______ present _____ to speak at the conference.
A. is, is 
B. are, are C. are, is D. is, are
【答案及解析】 C
句意：出席的学生中只有一个人要在会议上发言。分析句子可知，第一空的主语是who，指代的是the students，谓语动词应用复数，应填are；第二空中的主语Only one of the students，主语强调的是only one，谓语动词用单数，应填is，故选C。
【总结】考查主谓一致，以及定语从句。
