单项选择题

The child hid himself behind his mother's skirt, ______ he was afraid of the dog.

A．for
B．and
C．but
D．or
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单项选择题
______ there are only 20 minutes left before the train left, I felt uneasy in the taxi to the railway station.
A．That
B．When
C．Which
D．Because
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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