高考英语ABritishstatevisitisaformalaffair________avisitingheadofstateisgivenfullc
ABritishstatevisitisaformalaffair________avisitingheadofstateisgivenfullceremonialtrappings(礼遇)andishostedbytheQueen.
A.whenB.ifC.thoughD.because
请问为什么不能选B