单项选择题

It's really nice ______ you help me ______ray biology.

A．of; to; with
B．for; to; in
C．of; for; on
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单项选择题
— Must l turn off the light when I leave— No,______.
A．you mustn't
B．you can't
C．you needn't
单项选择题
He often comes to school______ foot. But he came ______his father's car today.
A．by; in
B．on; by
C．on; in
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