问题
选择题
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
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。