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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. thus B. otherwise

    C. therefore D. later

    B

    【解析】考查副词辨析。 A. thus“所以”； B. otherwise“否则”； C. therefore“所以”； D.later“后来”，该句句意为“这个泉水的守护者清除了树叶和树枝，挖掉了‘如果不去掉将会’堵塞污染清澈水流的淤泥。”所以该空选择B. otherwise相当于if it hadn’t been wiped away.

    考点：副词辨析

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