单选题Timmy is worrying about&n

问题补充：

单选题Timmyisworryingaboutenoughtimethework.A.not to have; doingB.not having; doingC.not to have; to doD.not having; to do

答案：

D解析worry about 表示担心。后接动词的ing形式，而have ···sth to do，为动词不定式作为后置定语，想