问题补充:
Many children seldom communicate with adults, it difficult for their parents to know what they are thinking about.
A. making
B. makes
C. to make
D. made
答案:
(答案→)A. making
B. makes
C. to make
D. made
解析:考查现在分词做结果状语:句意:很多孩子很少和成年人交流,这使得父母很难知道他们在想什么。因为是顺理成章的结果,用现在分词做结果状语,选A。