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

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

admin2013-09-03  48
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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