问题补充：
The little girl was allowed to go swimming she must keep herself near her father.
A. when
B. in case
C. in order that
D. on condition that
答案：
A. when
B. in case
C. in order that
(答案→)D. on condition that
解析：词义辨析题。A. when表时间 B. in case表假设“万一” C. in order that表目的 D. on condition that表条件“只要”“只要小女孩在父亲身边，父亲允许她游泳。”
