【题目】Magic shows are entertaining ______ the audience does not discover how the tricks are done.
A. so that B. as long as
C. as if D. ever since
在线课程【答案】B
【解析】考查固定短语。A. so that以便；B. as long as只要；C. as if似乎；D. ever since从那时起。句意：只要观众没有发现魔术表演是怎么做的，魔术表演就很有娱乐性。此处表示条件，故选B.