【題目】More historical buildings in the old town will fall down________we try our best to protect them.
A.if
B.since
C.unless
D.in order that

【答案】C
【解析】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(lái)， unless ：如果不， in order that：為了。結(jié)合語(yǔ)境可知應(yīng)故選C。

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