问题
选择题
Jack never stops talking. He is much ___ than his brother.
A．outgoing
B．more outgoing
C．outgoinger
D．outgoingest
答案
答案：B
B 考查形容词的比较级。Outgoing是一个多音节形容词，需要借助于more和most构成比较级和最高级。故选B。
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面磨除的厚度平均为（）