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Theeightfishermenonboard(send)tothehospitalbyyesterdaymorning.hadbeensent为什么答案是这个,hadsent哪里不对.

题目详情
The eight fishermen on board___(send) to the hospital by yesterday morning.
had been sent 为什么答案是这个,had sent 哪里不对.
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答案和解析
是HAD BEEN SENT 表被动