问题补充：
Yao Juan is the only one of the students whoto be praised.
A. are
B. have been
C. is
D. has been
答案：
A. are
B. have been
(答案→)C. is
D. has been
解析：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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