________hehasmanyfriends,heisoftenfeelinglonely.
C
状语从句的从属连词的选取。
InEurope_______arethetwoleadingcontendersforaglobalreservationssystem.
WhichofthefolloingisNOTincludedinthefabledFiveMountainsinChina?
TheWesternCouncilforTravelResearchin_______employedthetermvisitor.
Thehousewasquietinthenight,________theoccasionalcoughingfrommythroat.