I sometimes have ____ to visit Birmingham on business.

I sometimes have ____ to visit Birmingham on business.
A opportunity B occasion C chance D. possibility

1 我怎么觉得哪个都行呢？请高手指点！
2 请问occasion,chance,opportunity的区别
请简明而要，不要照搬词典

hav I been urs 这句话什么意思啊 SomEtimeS i wondeR. 中文什么意思 【求一首歌】Mario Frangoulis的Sometimes I Dream sometimes,i work from home。是什么意思啊 外国人说I want u to hav my baby什么意思？ 有一首歌是布兰妮唱的，开头是Some times i run ,sometimes ,i.... sometimes ,I wish I were an angel.sometimes, I wish I were you.这句话有语法错误吗？ why my optical mouse cannot function sometimes and sometimes can function? i am using windows XP sometimes i didn't understand her english I sometimes have ____ to visit Birmingham on business.