Question

(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

Answer 1

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”。