(2011年陕西西安分科质检)Afterworkingonthemathsproblemforhours，hefoundhethoughtwasthekeytoit.A．whatB．thatC．wher

Question

 (2011 年陕西西安分科质检 ) After working on the maths problem for hours ， he found________he thought was the key to it.

A ． what                            B ． that

C ． where                          D ． which

Answer 1

解析 ：选 A
。 what 引导的名词性从句作 found 的宾语从句的主语，而且 what 在宾语从句中作主语。 he thought 为插入语。