________ he found the idea interesting, it was too difficult to be of practical use.
A．WhileB．OnceC．IfD．Until
A

試題分析:句意：盡管他認(rèn)為這個(gè)想法有趣，但是這個(gè)想法還是太難了而沒有實(shí)際用處。A盡管，當(dāng)……時(shí)候；B一旦；C如果；D直到。根據(jù)前后句意可知此處是轉(zhuǎn)折關(guān)系，選A。
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