______we draw usefullessons from them,we may turn difficulties to good account.

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问题 ______we draw usefullessons from them,we may turn difficulties to good account.

选项 A、Unless   
B、Though   
C、Provided
D、Although

答案C

解析 前后句为条件状语从句与主句的关系,可排除B、D项。unless相当于if…not与句意不符。Provided与if意思相近,不是过去分词,而是引导条件状语从句的连词,意为“只要”。全句句意为:只要我们从他们那里吸取教训,就能将困难转化为优势。因此选C。
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