更新时间2019-12-31 23:14:13
She was a really good student,but her grades——(fall)since three months ago
横线中应该填什么,是have fallen还是had fallen,请详细说明理由
横线上填 have fallen (fall 的现在完成时)
就说话的时点而言,谓语动词 fall 应该用现在完成时态,因为后面有时间状语 since three months ago.
She was a really good student,but her grades(have fallen)since three months ago.
她(过去)曾是个好学生,不过从3个月前开始成绩下滑了。
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