He (work)______on the farm for five years before he went to the college.

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问题 He (work)______on the farm for five years before he went to the college.

选项

答案had worked

解析 根据题意,他上大学这件事发生在过去某个时间,那么谈到在此之前的他在农场工作的事情,自然要用过去完成时,即had done sth. 的形式。
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