单项选择题

When was the gasoline engine ______

A． found
B． discovered
C． invented
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单项选择题
Tom didn't go to school, ______ .
A． nor did Mary
B． nor Mary did
C． Mary didn't too
单项选择题
There are ______ students in our school.
A． four hundred twenty
B． four hundred and twenty
C． four hundreds and twenty
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