—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. must
B. can
C. should
D. need
网友回答
A. must
B. can
(答案→)C. should
D. need
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。