【题目】His writing is so confusing that it’s difficult to make out _______ it is that he is trying to express.
A. that B. how C. what D. who
在线课程【答案】C
【解析】
试题分析: 考查宾语从句和强调句型。空格处引导一个宾语从句,在从句做又包含着what引导的强调句的特殊疑问句,排除AC,what引导的特殊疑问句作为make out的宾语要使用陈述语序。故C正确。