单项选择题

Hurry up, ______you' ll be late for school.

A. but
B. or
C. so
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单项选择题
He knew nothing about it ______ his friend told him.
A. until
B. if
C. because
单项选择题
Pens ______ by people for writing.
A. use
B. using
C. are used
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