Question

【题目】His writing is so confusing that it’s difficult to make out it is he is trying to express.

A. that

B. how

C. who

D. what

Answer 1

【答案】D

【解析】本题考查的是what引导的名词性从句。what在该句中引导宾语从句，且what在从句中作express的宾语。