问题
选择题
It's unfair! You sit there ,listening to me, _____ I stand here, teaching you. [ ]
A. when
B. as
C. while
D. since
答案
答案：C
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It's unfair! You sit there ,listening to me, _____ I stand here, teaching you. [ ]
A. when
B. as
C. while
D. since
答案：C