1. Cajuns speak a dialect brought to southern Louisiana by the four thousand Acadians who migrated there in 1755; their language is basically seventeenth-century French to which has been added English, Spanish and Italian words.
(A) to which has been added English, Spanish and Italian words
(B) added to which is English, Spanish, and Italian words
(C) to which English, Spanish, and Italian words have been added
(D) with English, Spanish, and Italian words having been added to it（C）
(E) and, in addition, English, Spanish, and Italian words are added
OG上说A错在has been，我觉得不能理解，C中主语是words，但A中不是，这里主语是which修饰的French，应该用单数，我觉得A错在那个to，改成which has been added English, Spanish and Italian words就对了，french被加入了words，是吗？ | 
