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11、She was wearinga full-length skirt which swept the ground.
which sweptthe ground 近一步说明拖地的,拽地的
12、Despite hergreat age, she was very graceful indeed, but, so far, the archaeologistshave been
unable to discoverheridentity.
But, so far, the archaeologists have been unableto discover her identity.
=It is still aproblemfor the archaeologists up tonow. Despite=in spite of(两者都是介词),后面 名词/
动名词 so far, up to now完成时的标志
discover her identity=find out her identity