【HemusthavelearnEnglishforthreeyears,___?A.hasn'theB.haven'theC.mustn'theD.didn'the网上有这种说法：陈述部分有must的疑问句,疑问部分根据实际情况而定.Hemustbeadoctor,isn'the?YoumusthavestudiedEnglishf】

　　HemusthavelearnEnglishforthreeyears,___?A.hasn'theB.haven'theC.mustn'theD.didn'the

　　网上有这种说法：陈述部分有must的疑问句,疑问部分根据实际情况而定.

　　Hemustbeadoctor,isn'the?

　　YoumusthavestudiedEnglishforthreeyears,haven'tyou?/didn'tyou?

　　Hemusthavefinishedityesterday,didn'the?

　　那这道题A和D都对吗?请详细讲解此题.