问题补充:
Mary had to go to a meeting,so she left her children at home.
A. playing
B. played
C. to play
D. having played
答案:
(答案→)A. playing
B. played
C. to play
D. having played
解析:考察动词leave用法。本句的动词leave使…处于…状态;leave sb doing sth让某人做某事;本句中的her children与play构成主动关系,且表示正在进行,故使用doing的形式。句意:Mary不得不去开会,所以她让她的孩子在家里玩。故A正确。