They claim that ________ 1，000 factories closed down during the economic crisis.
A、sufficiently
B、approximately
C、considerably
D、properly
【正确答案】：B
【题目解析】：sufficiently充分地；足够地；approximately大约，近似地；considerably相当地；非常地；properly 适当地；正确地。句意：他们声称经济危机期间大约有1000家工厂倒闭。
