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
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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
单项选择题
I'm willing to lend you a hand ______ busy I'm for the moment.
A. because
B. but that
C. but
D. however
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