问题
选择题
—Why! I have nothing to write about. _______ that you want me to say?
—Your summary for this term and holiday schedule.
A．What is it
B．What it is
C．What are they
D．What they are
答案
答案：A
句意：为什么？我没什么要写的。你究竟想要我说什么？这个学期的总结和假期计划。根据语境，此空为特殊疑问句的强调句型。结构为：疑问词+ is it + that，所以选A。
则由关系R得到关系T的操作是（）