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