单项选择题

Not until the bell had rung ______ the classroom in a hurry.

A．he came into
B．did he come into
C．he has come into
D．has he come into
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单项选择题
She said she ______ many good friends since she came to this city.
A．has made
B．makes
C．had made
D．made
单项选择题
Since nobody is answering the phone, they ______.
A．should have left
B．must have left
C．need have left
D．can have left
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