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    精英家教网 > 高中英语 > 题目详情
    —I don’t suppose they could have finished their experiment,      they?
    —       , they are still doing it in the lab.
    A．could; YesB．didn’t; NoC．have; NoD．couldn’t; Yes
    C
    本题考查反义疑问句。句中主语为第一人称，且为否定，故从句为否定转移，故用have they.句意：——我认为他们不可能完成他们的实验，是吗？——是的，他们仍然在实验室做实验。
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