The Smiths have gone to New York for their holiday, with an old servant ____ their house.
A.looking after
B.look after
C.having looked after
D.looked after
网友回答
A解析考查复合结构。An old servant与look after构成主动关系。所以使用现在分词形式，排除BD，本题没有完成形式。句意：斯密斯一家已经去了纽约度假，留一个年老的仆人照顾房子。