Many ads__teenagers.A.are aimed at B.aim at 选哪一个?另一个为什么不行?

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Many ads__teenagers.A.are aimed at B.aim at 选哪一个?另一个为什么不行?

选A
aim at + 某事物：以什么为目标（有种try to do的意思）
be aimed at + 人或某事物：针对什么人或事
这句话的意思是说：很多广告是针对年轻人的,所以选be aimed at

Many ads__teenagers.A.are aimed at B.aim at 选哪一个?另一个为什么不行? Many Many many many many 3ks~ many .many of用法 how many visit many too many so many Many other Many thanks many a score many Many people many a beyond many many friends many of