问题
选择题
He'll never say a word about it ___ you have explained it to him.
A．once
B．before
C．on order that
D．so that
答案
答案：A
once意为:一旦,引起时间状语从句.
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He'll never say a word about it ___ you have explained it to him.
A．once
B．before
C．on order that
D．so that
答案：A
once意为:一旦,引起时间状语从句.