There is no light in the room. They must have gone to the lecture.__________?
A．didn’t theyB．haven’t theyC．don’t theyD．mustn’t they
B
本題是一個反義疑問句，前句是肯定的句子，后句應(yīng)該用否定的結(jié)構(gòu)+人稱，前句的助動詞是have，故用其否定形式haven’t，故本題選B。
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