More historical buildings in the old town will fall down ________we try our best to protect them.
A．ifB．sinceC．unlessD．in order that
C

試題分析：句意為：如果我們不盡力保護(hù)，老城里更多的歷史性建筑將倒塌。if：如果， since：自從……以來， unless ：如果不， in order that：為了。結(jié)合語境可知應(yīng)故選C。
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