A.Once
B.Until
C.Though
D.Before
第1题
______ you understand this rule, you'll have no further difficulty.
A.Once
B.Unless
C.Only
D.Until
第2题
_____you understand this rule, you' have no further difficulty.
A.Once
B.Unless
C.As
D.Until
第3题
______ you understand this rule, you'll have no further difficulty.
A.Once
B.Unless
C.Only
D.Until
第4题
______you understand this rule, you'll have no further difficulty.
A.Once
B.Unless
C.Only
D.Until
第5题
a.While
b.Though
c.Unless
d.Once
第6题
________you understand this rule, you'll have no further difficulty.
[A]Once
[B]Unless
[C]Only
[D]Until
第8题
参考答案:错误
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