The elderly patients still prefer the traditional way, online booking system is supposed to be convenient and fast.
A. while
B. though
C. unless
D. as
网友回答
A. while
(答案→)B. though
C. unless
D. as
解析：考察连词辨析。A当…时，然而；B尽管；C除非；D因为，一边…一边…；结合句意可知B正确。句意：尽管在线的预定系统很方便迅捷，但是那位年长的病人仍然喜欢传统的方法。