单项选择题

A number is an abstraction ______ no physical existence.

A．has
B．to have
C．that has
D．who has
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单项选择题
Women who apply for jobs in middle or senior management have ______ success than men, according to an employment survey.
A．much higher
B．a very higher
C．a much higher
D．far higher
单项选择题
Out ______ after the class was over.
A．did children rush
B．rushed children
C．children rush
D．do children rush
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