问题
选择题
Jane is one of the best students in her class who _____by their teacher.
A．are praised
B．is praised
C．praised
D．praising
答案
答案：A
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Jane is one of the best students in her class who _____by their teacher.
A．are praised
B．is praised
C．praised
D．praising
答案：A
对一切n∈N*恒成立，求证：d≤a1q-a1；