题目内容
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
D解析:句意:他的书写是那么混乱,以至于想要弄明白他在试图表达什么是很困难的。what引导名词性从句,在从句中可作主语、宾语、表语或者定语。分析题干可知,宾语从句中express后缺少宾语,故只有what适合题意。
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