you understand the rule, you will find it easy to keep it.A.WhileB.AsC.OnceD.Whe
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________ you understand the rule, you will find it easy to keep it.
A.While
B.As
C.Once
D.Whether
试题答案
C
________ you understand the rule, you will find it easy to keep it.
A.While
B.As
C.Once
D.Whether
C