题目内容：

Many ads __________________ specifically at teenagers in the modern world.
Many ads __________________ specifically at teenagers in the modernworld.(aim)

优质解答

Many ads __aim____ specifically at teenagers in the modernworld.(aim)句子缺少谓语动词,直接用一般现在时的aim就可以了

追问：

为什么答案是 are aimed ........

追答：

be aimed at也是固定搭配，这里的aimed是aim的过去分词，相当于形容词。aim也可以单独做动词的。两个都可以。