问题
选择题
The reason__________ their failure you know is__________ they didn't get fully prepared for the experiment．
A．why, that
B．that, why
C．for, that
D．why, because
答案
答案：C
题目分析:重点在句子成分分析，is 为主句谓语。You know 为定从 that 引导表语从句。
for 表“对于”。句意：对于你知道的他们失败的原因是他们没有为实验做充足的准备。故选C
点评：本题较难，乍一看不知如何下手，所以认真分清句子成分是解题的关键。可利用排除法解题。