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According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed(诊断) note.
A.now thatB.if C.unlessD.even though
B

试题分析:根据句意根据厂里的规章制度,如果你有医生的诊断书,你才能请假。故选B
A.既然 B.除非…否则 D.即使
点评:本题注意unless一词,unless一词前面常要有否定意义的词,句意才符合逻辑。例如:We will easily become unhappy unless we deal with our problem well.
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