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ItisBill'sresponsibilitythatallthevisitorshaveachair.A,ofseeing,B,ofhavingseen,C,tosee,D,tohaveseen

题目详情
It is Bill's responsibility ____ that all the visitors have a chair.
A, of seeing, B, of having seen, C, to see, D, to have seen
▼优质解答
答案和解析
C to see It is sb's responsibility to do sth.