问题
选择题
His writing is so confusing that it's difficult to make out ________ he is trying to express.
A．what is it
B．what is it that
C．what is that
D．what it is that
答案
答案：D
D 考察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D正确。