Question

Being exposed to loud music too much ________ caused hearing loss in some teenagers

1. A.
   is
2. B.
   has
3. C.
   are
4. D.
   have

Answer 1

B
：考查主谓一致和时态。单独的一个动名词短语在句子中做主语时，谓语动词用单数。句意：过多的暴露在吵闹的音乐下已经导致了一些年轻人的听力损害。故B正确。