摘要：Xiao Ming is a very i boy. He knows the answer to any question.
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Xiao Ming is the student _____ pronunciation is the best in our class.
A. who B. whom C. whose D. his
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单句改错：下面句子有一处错误，请指出并改正。
Xiao Ming is clever and works hard, so all the teachers think high of him．