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that day when we finally got to the river,we found the boat-

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that day when we finally got to the river,we found the boat-----------to the bottom of it.
A,sank B,was sinking C,has sunk D,had sunk
that day when we finally got to the river,we found the boat-
大意:我们终于去了这条河的这天,我们发现了这条船,……沉在河底
这里是过去完成时态,过去去河边的时候,已经发现沉在河底了
所以选择 D,had sunk
再问: 那像这道题,When i passed by his seat,i found he--------to pick up something on the ground. 为什么填was bending呢