问题
选择题
(2013·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
答案：C
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”。