单项选择题

______ , this kind of disease can do great harm to people there.

A. Occurring where
B. It occurs where it is
C. Where does it occur
D. Wherever it occurs
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单项选择题
According to the rules of the factory, you mustn't ask for leave ______ you have a doctor's note.
A. unless
B. on condition
C. though
D. until
单项选择题
If you lose one hour in the morning, ______ you will be looking for it the rest of the day.
A. /
B. and
C. or
D. so
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