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Their experiment ________,Tom and Marry set out to write the

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Their experiment ________,Tom and Marry set out to write the report on the results.A.done 为什么?
为什么要选A .A.done B.to be done C.being done D.will be done
Their experiment ________,Tom and Marry set out to write the
选A是正确的,应该填done,因为这个空的非谓语动词和前面的experiment构成动宾关系,所以用过去分词表示被动,作原因状语,还可以填having done.