问题描述：
请帮我解决这些英语问题,说明理由.
（1）My mother used in the factory when she was young.A：work B：worked C：working D：work （2）One of our teacher from hunan.A：are B:comes C:were D:come （3）They the ribverby boat A：come B：came C：to come D：coming
（1）My mother used in the factory when she was young.A：work B：worked C：working D：work （2）One of our teacher from hunan.A：are B:comes C:were D:come （3）They the ribverby boat A：come B：came C：to come D：coming
问题解答：
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