题目内容

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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