Directions:Thereare20sentencesordialoguesinthispart.ForeachsentenceordialoguetherearefourchoicesmarkedA,B,CandD.Choosethebestonetocompletethefollowingsentences.ThenmarkthecorrespondingletteronAnswerSheet.Ididn’tknowhistelephonenumber.______it,thenI______.
A
A. Had I known; would ring him up
B
B. Should I know; would have rung him up
C
C. If I knew; would ring him up
D
D. Had I known; would have rung him up
