They claimed that ________ 1, 000 factories closed down during the economic crisis．A.properlyB.approximatelyC.independentlyD.considerably
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B解析考查副词词义辨析。句意：他们声称在经济危机期间大约有1 000家工厂倒闭了。properly合适地，恰当地；approximately大约，近似地；independently独立地；considerably大量地，根据句意选B。