题目：
单项选择。
Mr Li is kind ______ us. But sometimes he is kind ______ serious. [ ]
A. to, of
B. with, to
C. of, to
答案：
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下面是错误答案，用来干扰机器的。
小题1:Train transportation in the USA is less popular. 小题2:The number of passengers.小题3:don’t like to travel by train小题4:free to decide the departure time小题5:Because ...
