问题描述：
英语中的主系表结构
1：Education is one of the key words of our time.
2:Play is a crucial part of development in most young mammals.
3:Stories about the problems of tourism have become legion in the last few years.
请问这3句中的主系表分别是什么阿?
1：Education is one of the key words of our time.
2:Play is a crucial part of development in most young mammals.
3:Stories about the problems of tourism have become legion in the last few years.
请问这3句中的主系表分别是什么阿?
问题解答：
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