单项选择题

The teacher said that the heavy object()at the same speed as the light one.

A．fall
B．fell
C．falls
D．is falling

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单项选择题

The old man has two rooms, one of () is used as his study.

A．which
B．that
C．them
D．whom

单项选择题

Mary was () to school when she saw the accident.

A．on her way
B．in her way
C．by her way
D．in a way

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