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    精英家教网 > 高中英语 > 题目详情
    This is a______ but extremely difficult technology in the future.
    A．satisfactoryB．costlyC．promisingD．far-fetched
    C
    考查语境下的词义辨析。promising意为“有希望的”。将来的话，还没有使用，排除A；B,D与后面的extremely dofficult不能构成转折。
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