It is the fans that support the kingdoms of the recording companies; 29, the industry never gives its feedback to the fans—by lowering the prices of CDs.
答案：(B) however
前後句語意對比：「粉絲支撐了唱片公司的王國」vs「業界卻從未回饋粉絲」，however 表達這種轉折對比。indeed（確實）、hence（因此，因果）、furthermore（此外，累加）都不符合這裡「前後對比」的邏輯。
however 你的印象大概是「出現在句首、前面要有句號」，所以看到它要填在分號後面會猶豫。however 屬於連接副詞，可以出現在副詞能出現的任何位置（劍橋 English Grammar Today）；分號後面接 however 再加逗號，是很常見的寫法。
分號不是句界，前後兩半在同一句裡。前半：支撐唱片公司王國的是歌迷。後半：業界從未回饋歌迷，也就是從未調降 CD 售價。前面是歌迷付出、後面是業界不回報，一正一負，要的是轉折，用 however（然而）。這是邏輯勾環：先確定前後兩半同向還是反向，再挑轉承語。另外這一句也是強調句型 It is the fans that support ...，被強調的是主詞 the fans（歌迷）；依劍橋 English Grammar Today，焦點是人的時候，that 也可以寫成 who。
indeed（的確）：用來加強、確認前面的說法，方向同向。hence（因此）：表結果，但「歌迷支撐了唱片業」推不出「業界不回饋」，那是相反的事。furthermore（此外）：再加一件同方向的事，同樣表達不出落差。
however（然而，可插在句中）、give feedback to（給……回饋）、lower the price of（調降……的價格）、indeed（的確，用於加強）、hence（因此，表結果）、furthermore（此外，用於補充）。
Many entertainment celebrities, on April 5, 2002, attended an anti-piracy demonstration in Taipei. The purpose of the rally was to ask fans to respect the copyright and to stop buying 26 CDs. Although the intellectual property right is to be protected by law, the fans may think otherwise.
Obviously, it is the recording industry that wants to 27 piracy. Celebrities in the rally probably have no idea about how much a CD of their music albums costs. After signing million-dollar contracts with recording companies, singers devote most of their time 28 their music perfect while companies are busy commercializing their products.
It is the fans that support the kingdoms of the recording companies; 29, the industry never gives its feedback to the fans—by lowering the prices of CDs. It is an easy arithmetic 30. When one can buy a CD of pop music for NT$50 anywhere on the streets, why does he or she want to spend NT$300 or more for the same one?