问题
选择题
____ ,I have never seen anyone who is as energetic as Barack Obama.
A．As long as I have interviewed many leaders
B．Since I have interviewed many leaders
C．Many leaders although I have interviewed
D．Many leaders as I have interviewed
答案
D
考查特殊句式。句意为：虽然我采访过很多领导人，但是我从未见过像奥巴马这样精力充沛的人。此处是as引导的让步状语从句，句中的as可用though代替，不可用although，因此C项错误。A项表示“只要我采访了很多领导人”；B项表示“既然我采访了很多领导人”，语句都不通顺。