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问题: He had no idea of how the climb would be ____he was half way up the mountain.

A.when B. unitl C. while D. as
分析哦 

解答:

从逻辑意思上来看应该选B.因为只有实际爬了山才会知道爬山是什么感觉,如果选when,爬到一半还没感觉,就不符合逻辑了。