单项选择题

The bell ______. Please open the door, Jim.

A． rings
B． is ringing
C． ringed
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单项选择题
A ______school boy was passing the road when a car came over.
A． 12-year old
B． 12-year-old
C． 12-years-old
单项选择题
The soldier ran into the room ______ the baby.
A． saving
B． to save
C． saves
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