The lecture mainly deals with the trouble young children have right from wrong.
A. distinguished
B. distinguishing
C. to distinguish
D. to be distinguished
网友回答
A. distinguished
(答案→)B. distinguishing
C. to distinguish
D. to be distinguished
解析：首先have difficult /trouble doing sth是固定词组。The lecture mainly deals with the trouble young children have distinguishing right from wrong在这个句子中，deal with的宾语是trouble，所以后面的句子是修饰trouble这个词的定语从句。