【题目】The little boy was allowed to go to have a swim _____ he finished his homework.
A. in case B. provided that
C. now that D. by the time
在线课程【答案】B
【解析】
试题分析：考查连词辨析 A. in case以防万一；B. provided that 在。。条件下；C. now that 既然；D. by the time到。。为止。句意：小男孩假定完成了作业就允许去游泳。两个句子是条件关系，故选B项。
考点 : 考查连词辨析