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_____more countries can use natural energy in the future remains to be seen.
A．WhetherB．ThisC．whoD．If
A
考查主語從句，句意：是否更多的國家在將來會(huì)使用自然資源有待于看看。意思是是否時(shí)，引導(dǎo)主語從句，用Whether 不用If，所以選A。
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