问题
选择题
His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽，33)
A．that
B．how
C．who
D．what
答案
答案：D
句意：他的写作如此令人费解，很难弄清楚他到底想要说什么。what作express的宾语。
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