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如何排除B项beingsupportedecouldseetheoldman----byhisgrandsontakingawalkinthepark.AsupportingBbeingsupportedCsupportedDhavingsuppored

题目详情
如何排除 B项being supported
e could see the old man ----by his grandson taking a walkin the park.
A supporting B being supported C supported D having suppored
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答案和解析
see后面跟-ing但这句句子中see的显然不是B而是taking a walkin,所以supported只能是过去分词作定语