单项选择题

I won't leave the house ______your father is back.

A．that
B．till
C．as
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单项选择题
This is my new dictionary. It was a gift ______Mary.
A．from
B．to
C．at
单项选择题
She______ a book when the doorbell rang.
A．reads
B．has read
C．was reading
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