---Who did it sound like?Anybody you know?---Well, perhaps, Jeff．I ______ who was calling before he hung it up．A.must have askedB.needn’t have askedC.couldn’t have askedD.should have asked
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D解析从perhaps Jeff可知下文是“我本应该在他挂电话之前问一下谁打来的”。should have done 表示本应该做某事。