问题补充：
The little boy was allowed to go swimming he kept near the other boys.
A. provided that
B. in case
C. now that
D. by the time
答案：
(答案→)A. provided that
B. in case
C. now that
D. by the time
解析：考查连词：A. provided that如果，以…为条件，B. in case 以防C. now that 既然D. by the time到…时候为止，句意：小男孩被允许去游泳，条件是他能和别的男孩靠近些。选A.
