—IwonderwhyJacksonwasabsentfromyesterday’sconference.—Hemusthavebeenill?A．isn’theB．wasn’theC．didn’theD
— I wonder why Jackson was absent from yesterday’s conference.
— He must have been ill ?
A ． isn’t he B ． wasn’t he C ． didn’t he D ． mustn’t he
B
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