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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

试题分析:句意为:如果我们不尽力保护,老城里更多的历史性建筑将倒塌。if:如果, since:自从……以来, unless :如果不, in order that:为了。结合语境可知应故选C。
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