这里应该填had 或者 kept.
你给的四个选项都不对.
因为是for a year,这是很长的一段时间,所以用持续性动词.buy是短暂的动词,所以排除AB
CD时态不对.我估计你打错了.要么是had带成了have,要么是kept 达成了kept on.
He has _______ the watch for a year.A buy B.bought C.have D.
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