问题

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

正确答案是：

同类题型

It is in Chengdu No.7 High School _______ a variety of activities are offered _______ I am able to develop my interests.

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Who helped you clean the classroom yesterday— Nobody. I did it all by ____.

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