It was with the help of the local guide the mountain climber was rescued.
A. who
B. that
C. when
D. how
网友回答
(答案→)A. who
B. that
C. when
D. how
解析：考查强调句。强调句的结构是：It is/was+强调部分+that+其余部分…。（如果强调的是人，就用who）这句话强调的是with the help of the local guide，该句可还原为the mountain climber was rescued with the help of the local guide，故可知为强调句，因为不是强调的人，不能用who，答案选A。