although 也對。參考
https://tinyurl.com/ybkwvl22 英文語言/文法書籍
https://tinyurl.com/y8kxb5hq The New York Times 的例although 是有這樣子的用法:
https://tinyurl.com/y8tndlwp ->Usage Note 找When though introduces only .....但是原題目句子的"not"是代前頭整句(的否定):not: [new one are coming in]否定 ->{(new ones are) not (coming in)} {as quickly as ..}這跟Usage Note裡頭提到的"introduces only a part of aclause"不一樣題目原句子出自 Costco 的刊物(是用 but)。但是出題人沒注意到 although 也是正確用字