Obama didn’t explain ______ any larger principles have guided him through the historic convulsions of the 2011 Arab Spring.
A．whatB．thatC．whereD．whether
D

這題考查whether引導(dǎo)賓語從句的用法：句意是：奧巴馬沒有解釋是否有任何較大的原則指導(dǎo)他通過歷史驚厥的2011個春天。選D。
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