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Peter had been puzzled over the problem ...

Peter had been puzzled over the problem for over an hour___________ all at once the solution flashed across his mind.

A.when B.while C.then D.as

 

A 【解析】 考查状语从句连词。句意:Peter已经被这个问题困扰一个多小时了,突然解决方法从他脑海里闪过。A. when当……时候;B. while当……时候,尽管,然而;C. then然后;D. as当,因为,尽管。分析句子可知,此处考查固定句型had done…when…“已经/刚做完某事……(突然)就……”,故选A项。  
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