问题
选择题
______ you understand the rule, you can do it well.
A．For
B．As
C．Once
D．While
答案
答案：C
once连词，引导状语从句，"一旦"。
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______ you understand the rule, you can do it well.
A．For
B．As
C．Once
D．While
答案：C
once连词，引导状语从句，"一旦"。