常见的连接词有though, although，

　　区分though，although，

　　eg：

　　as 表示虽然的时候，要进行倒装

　　eg：

　　while：连接两个句子，表示虽然，但是

　　eg：

　　真题分析：

　　(直到一名医生偶然发现了它

　　2.I would prefer shopping online to shopping in a department store because __________(它更加方便和省时

　　3.But since water is much cheaper than wine, and many of the fancier brands aren’t available in stores, most diners don’

　　4. While there’s no question that continuous stress is harmful, several studies suggest that challenging situations in which you’