问题
选择题
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
答案
答案：B
题目分析：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.