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

A. that B. how

C. who D. what

【答案】D

【解析】句意：他的書寫如此令人困惑，以至于難以辨認他在試圖表達什么。分析句子結構可知，定語從句he is trying to express后缺少賓語，因此用what。

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