题目内容
According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed(诊断) note.
| A．now that | B．if | C．unless | D．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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