The boys _____ for so long a time.A.have run B.were running

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The boys _____ for so long a time.A.have run B.were running

The boys _____ for so long a time.A.have run B.were running
The boys _____ for so long a time.A.have run B.were running

The boys _____ for so long a time.A.have run B.were running
A,
for so long a time.
表示持续一段时间,所以用完成时态