1)You____allthoseclothes!Wehaveawashingmachinetodothatsortofthing A)needn'thavewashed B)shouldn'thavewashed C)mustnothavewashed D)cannothavewashed 2)John'sscoreonthetestisthehighestintheclass;he____lastnight. A)shouldstudy B)shouldhavestudied C)musthavestudied D)musthavetostudy 3)Theroomisinaterriblemess;it____cleaned.(CET-4,1996,6) A)can'thavebeen B)shouldn'thavebeen C)mustn'thavebeen D)wouldn'thavebeen 4)Nobodyknowshowpeoplefirstcametotheseislands.They____fromSouthAmericaonrafts. A)musthavesailed B)cansail C)mighthavesailed D)shouldhavesailed 5)Marywasnotinherbedroomyesterdayafternoon.She____inherclassroom. A)shouldhavebeen B)musthavebeen C)mustbe D)shouldbe 答案：ACACB
