问题
选择题
__________ you understand the rule, you will have no further difficulty.
A．While
B．Once
C．Though
D．Unless
答案
答案：B
本题考查连词的区别辨析。once指的是“一旦”。
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__________ you understand the rule, you will have no further difficulty.
A．While
B．Once
C．Though
D．Unless
答案：B
本题考查连词的区别辨析。once指的是“一旦”。