________ he found the idea interesting, it was too difficult to be of practical use.

A. While B. Once C. If D. Until

 

A

【解析】

試題分析:句意：盡管他認為這個想法有趣，但是這個想法還是太難了而沒有實際用處。A盡管，當……時候；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。

考點：考查狀語從句。

 

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