(·日照一模)—What has made John look like lacking sleep?— he had to prepare for the coming

问题补充：

(·日照一模)—What has made John look like lacking sleep?

— he had to prepare for the coming exam and stayed up last night.

A. For

B. Because

C. That

D. What

答案：

A. For

B. Because

(答案→)C. That

D. What

解析：选C考查名词性从句。分析句子结构可知，答语是回答上面句子中的主语“What”的，故此句是一个主语从句，缺少引导词，而引导词在从句中不充当成分，故用“That”。