iscertain，though，isthat"thecurseofthemummy"remainsariddletothisday．（）A.ThatB.WhatC.WhichD.It

Question

_____ is certain，though，is that"the curse of the mummy"remains a riddle to this day．（　　）

A. That

B. What

C. Which

D. It

Answer 1

答案B．
分析句子结构可知，整个句子的谓语动词为"is"，"is"后为表语从句，"_____ is certain"为主语部分，主语从句中谓语动词"is"前缺少主语，不指人，因此应该用疑问代词"What"来引导主语从句，该句的句型为"What is certain is that+从句"意为"可以确定的是 …"，故选B．