问题补充：
It was only with the help of the local guide .
A. was the mountain climber rescued
B. that the mountain climber was rescued
C. when the mountain climber was rescued
D. then the mountain climber was rescued
答案：
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.
