单项选择题

He knew nothing about it ______ his friend told him.

A. until
B. if
C. because
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Pens ______ by people for writing.
A. use
B. using
C. are used
单项选择题
Why are you ______ a hurryWe are going to have a physical (物质的,身体的) exam an hour.
A. in... after
B. in... in
C. on... in
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