单项选择题

When the bell rang announcing the end of class, students came out ______

A．by twos and threes
B．by two and three
C．by two or three
D．by twos or threes

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单项选择题

I really can't figure ______ who the person that phoned me just now was.

A．out
B．from
C．at
D．out of

单项选择题

A．such
B．of
C．from
D．as

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