When we got down to work,a lot of difficulties ______ (arise).请教此空填什么时态,
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![When we got down to work,a lot of difficulties ______ (arise).请教此空填什么时态,](/uploads/image/z/10534036-4-6.jpg?t=When+we+got+down+to+work%2Ca+lot+of+difficulties+______+%28arise%29.%E8%AF%B7%E6%95%99%E6%AD%A4%E7%A9%BA%E5%A1%AB%E4%BB%80%E4%B9%88%E6%97%B6%E6%80%81%2C)
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