---It’s eight o’clock already. Jack be here by now.---Oh, he told me that he was going to see his dentist and wouldn’t be back until ten.A.mustB.canC.shouldD.need
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C解析考察情态动词，四个选项分别表示必须一定、能、应该和需要。根据题意，已经八点了。杰克现在应该到那了。——哦，他告诉我他要去看他的牙医并且知道10点才回来。根据题意，此处表示推测，故选C。