Obama didn’t explain any larger principles have guided him through the historic convulsions of the 2011 Arab Spring.
A. what
B. that
C. where
D. whether
网友回答
A. what
B. that
C. where
(答案→)D. whether
解析：
这题考查whether引导宾语从句的用法：句意是：奥巴马没有解释是否有任何较大的原则指导他通过历史惊厥的2011个春天。选D。