单项选择题

Mary is a famous writer though she is still （） her twenties.

A．about
B．on
C． in

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单项选择题
Sally must be very sad. She was （） crying in her bedroom.

A．to see
B． seen
C．seeing
单项选择题
Can you help me I can' t find my key （） the door anywhere.

A．with
B．in
C．to
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