This is a______ but extremely difficult technology in the future.
A．satisfactoryB．costlyC．promisingD．far-fetched
C
考查語(yǔ)境下的詞義辨析。promising意為“有希望的”。將來(lái)的話，還沒(méi)有使用，排除A；B,D與后面的extremely dofficult不能構(gòu)成轉(zhuǎn)折。
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