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The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.
A.thusB.otherwiseC.thereforeD.later
B

试题分析:A. thus因此,B. otherwise否则,C. therefore因此,D. later后来,句意:泉水的守护者清除了树叶和树枝,挖掉了如果不去掉就会堵塞污染清澈的水流的淤泥。这里用otherwise相当于if it hadn’t been wiped away,所以选B。
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