What impelled the boy to take so much trouble to spare the feeli

What impelled the boy to take so much trouble to spare the feelings of a stranger?
A、Why did the boy trouble himself to save stranger?
B、Why did the boy try so hard to make friends with a stranger?
C、Why did the boy try his best to build up the confidence of a stranger?
D、Why did the boy make such great efforts in order not to embarrass a stranger?
【正确答案】：D
【题目解析】：此句的意思是是什么促使这个男孩不厌其烦地这么做，为了不让陌生人感到难堪？Spare此处表示使某人免遭（麻烦等）。