—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
C
考察情態(tài)動(dòng)詞，四個(gè)選項(xiàng)分別表示必須一定、能、應(yīng)該和需要。根據(jù)題意，已經(jīng)八點(diǎn)了。杰克現(xiàn)在應(yīng)該到那了。——哦，他告訴我他要去看他的牙醫(yī)并且知道10點(diǎn)才回來。根據(jù)題意，此處表示推測(cè)，故選C。
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