It has sailed across the Atlantic many times . It has sailed across the Atlantic______.
A.SOMETIMES B.ALWAYS C.OFTEN D.USUALLY

答案是D，为什么不是A呢，是不是sometimes不能够放最后?

你好！

表示频度方面的区别。

always是频度最大的词,意为"总是；永远"。如: I shall always remember my first day at school.我将永远记住我上学的第一天。

usually意为"通常",即很少例外,频度仅次于always。如: What do you usually have for breakfast?你通常早餐吃什么？

often意为"经常",在频度上不如usually那么频繁。
如: Li Ping often does his homework in the afternoon.李平经常在下午做作业。

sometimes意为"有时候",频度比often小,表示动作偶尔发生,间断较大。
如: 1.I sometimes go to the library.我有时去图书馆。
2.Sometimes I read a book in the evening.我有时在晚上看书。