it must be teenagers ------------fun.A have B having C had D

问题描述:

it must be teenagers ------------fun.A have B having C had D to have
选什么,为什么?有语法知识吗
2个回答 分类:英语 2014-09-25

问题解答:

我来补答
B having 这里应该是非谓语做定语
再问: 能不能通俗一点
再答: having fun 修饰青年在做什么
 
 
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补充回答:

be后ing
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