高手请看这选择题 the three girls in this group are said ____
the three girls in this group are said ____ .
A to be a same age
B to be of an age
答案是B我不懂 是什么结构啊 A怎么错的? 是指同龄还是指达到了年龄
可不可以帮我多举几个 be of + n这种结构的例子
我还是没明白呢