21 Taiwanese companies have operated manufacturing bases in mainland China for several decades, which has given them extensive experience with markets there. (A) Taiwanese companies have built production bases in mainland China for many years because they want to understand the market there. (B) Taiwanese companies understand the Chinese market because they have had production bases there for many years. (C) With a good knowledge of the Chinese market, it is easy for Taiwanese companies to build production bases there. (D) In order to gain experience with the Chinese market, Taiwanese companies need to build production bases there.