问题
选择题
Yao Juan is the only one of the students who_________to be praised.
A．are
B．have been
C．is
D．has been
答案
答案：C
one of the students +定语从句，（从句谓语用复数）
the only one of the students +定语从句，（从句谓语用单数）
前后时态一致。
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