It was only with the help of the local guide .A. was the mountain climber rescuedB. that

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A. was the mountain climber rescued
(答案→)B. that the mountain climber was rescued
C. when the mountain climber was rescued
D. then the mountain climber was rescued
解析：考查“It be...that...”强调结构，句意：只有在当地导游的帮助下，登山者才得救。这里强调的是状语only with the help of the local guide，要用that，需要注意的是“only +状语(副词，介词短语，状语从句)”放在句首的时候，句子要部分倒装，但在强调结构中不能用倒装语序，故答案选B.