问题
单项选择题
No discount will begranted（）you place an order for more than 1000 dozen.
A.if
B.unless
C.whether
D.but for
答案
参考答案：B
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No discount will begranted（）you place an order for more than 1000 dozen.
A.if
B.unless
C.whether
D.but for
参考答案：B