Jack was halfway back to the village where his mother lived Mary caught up with him.A. wh

问题补充：

Jack was halfway back to the village where his mother lived Mary caught up with him.

A. when

B. while

C. until

D. though

答案：

(答案→)A. when

B. while

C. until

D. though

解析：考察连词用法。When在那时（并列连词）；while当…时（从属连词）；结合句意可知A正确。句意：Jack正在回他妈妈工作的村庄的半路上，在这时Mary赶上他了。