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

解析試題分析: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(lái), unless :如果不, in order that:為了。結(jié)合語(yǔ)境可知應(yīng)故選C。
考點(diǎn):考查連詞辨析。

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