问题
选择题
The president did much for world peace. That was ______ he was awarded the Nobel Peace Prize.
A．when
B．what
C．because
D．why
答案
答案：D
题目分析：句意：这个总统对世界的和平做出重大的贡献，那就是他为什么被授予诺贝尔和平奖的原因。A. when什么时候，B. what 什么，C. because因为，D. why为什么，所以选D。