According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed(诊断) note.
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A
now that
B
if
C
unless
D
even though
推荐题目
The students of the music school study ____. 
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A
music but also some other subjects
B
some other subjects as well as music
C
no subjects but music
D
neither music nor some other subjects