[单选题]Directions:Thereare20sentencesordialoguesinthispart.ForeachsentenceordialoguetherearefourchoicesmarkedA,B,CandD.Choosethebestonetocompletethefollowingsentences.ThenmarkthecorrespondingletteronAnswerSheet.Theyarrivedatafarmhouse,infrontof______satasmallboy.

A
A. whom
B
B. who
C
C. which
D
D. that
正确答案:C
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